Watch out for unscrupulous agents and "offers". I got signed up for a mobile line without my permission. I got sent to collections!

I have been a customer of Comcast/Xfinity since 9/2021.  I no longer trust this company and their shady agents.  I called to change my plan.  I told the agent;
1.) I need to downgrade my cable plan
2.) I need to keep the landline
3.) I need basic cable

4.) I need the internet speed to stay the same

He offered me a mobile line. I said "No" repeatedly.  He then offered me a "tablet" with no strings attached because of a promotion they were running.  If i took the tablet and paid around $50/mo my cable, internet and phone bill would be X amount of dollars per month, which sounded like a good deal.  I told him again "I do not want a mobile line"  He told me the tablet would not be mobile line, just a mobile device using WiFi.  I told him again that I did not want a mobile line at all.  He said it wasn't.  I was stupid and said "Ok" In signing the paperwork electronically.  I saw that one said "mobile"  I asked him again, directly if this was consent for a mobile line. He said "No, it's just for the mobile device using WiFi."  The tablet was sent to my son at my home address where I have service. 
I kept paying monthly via auto pay for my cable/internet/phone.  I went home to visit my son, (where my service is) we have an apartment in another state where we live part time.  I picked up my phone to check messages.  No phone!  That agent had disconnected my landline!  
I called Xfinity to find out what happened. My number had already been given away and no one could tell me what happened. No one took the time to listen to the recording of me STATING that I NEEDED to keep that line for very sensitive and personal reasons.  
A year goes by and I finally have time to log on to Xfinity to assess my plan.   My son doesn't watch TV, he uses the internet and that's it.  After the website changes I couldn't figure out where anything was, the site is unstable and keeps crashing so I really did need to set aside time to navigate through the site with multiple logins and redirects.  After no less than 3 redirects and sign-ins I  finally got to my plan. I found out I HAD been signed up for a mobile line against ALL of my verbal protests, and was lied to about the contract.  I only had my phone with me and couldn't really read it that well, that is my mistake, but they do use so much jargon it's hard to understand what is really being signed up for. 
When I saw this, I contacted them immediately to cancel this and pay off the device in full in May.  The agent at that time confirmed that my balance was zero.  The unwanted mobile line was cancelled, the device was paid off, I owed nothing more. She did not tell me that I was two days past the billing cycle date and would receive another bill.  A true testament here to customer service and satisfaction and transparency.   
I cancelled my cable plan totally and only retained the internet.  
I went to the website to find out what my actual payment amount is and the actual due date.  I have been on autopay for years.  I saw there was an outstanding balance so I called an agent on August 15th.  I was assured again this was an error and would be taken care of. I was promised a credit on my internet account for the trouble.  I have screenshots and a transcript of this chat.  
Surprise!  I  got a call from a collection agency in August!  I disputed this with the collection agent. I was told they turned it over August 6th.  I made a call to Xfinity on on the 22nd.  I was told this was in error and my account would be removed from collection because I owed nothing, I would get an email confirming it and a fabled credit.  I got an email from the collection agency.  Xfinity did nothing!   I called Xfinity again today and an agent finally told me that I was two....TWO days past the billing date.   They charged me $43.75 for two days including their $5.00 late fee!  

So not only did they destroy any hope of a person in crisis reaching me via the only phone number of mine they had, but they also scammed me out of hundreds of dollars and turned me over to a collection agency after being assured by two agents that I didn't owe and they would "definitely take care of it."  I paid the balance today to get this out of collections, for $43.75.  I really hope that $43.75 is worth the price of a decades old customer and a negative review on any platform I can find! Google, Yelp, this site, the BBB.  
I am absolutely DISGUSTED with this treatment and will be filing a complaint with the BBB, not that Xfinity cares.  Customer service seems to have become a thing of the past with the name change from Comcast. 
There is no way to look in my account for this "mobile order" placed in July 2024. Transparency is definitely NOT in their name.  Customers are treated like lambs to the slaughter.  They're only out for a buck and couldn't care less about order transparency, customer satisfaction or customer service.