Internet Dropping

I had a technician come about a month ago due to my internet dropping, buffering and generally running VERY slow at various times of the day. My two neighbours were having the same problems at the same time it was happening to my connection. The technician checked everything and also spoke with my neighbours. He also checked all the outside lines coming into the homes. He issued a ticket for the engineers to come to check the lines in the street as he said it looked like it was the lines coming in. In the meantime, I received phone calls from the support team who told me the internet will be monitored for problems. By magic, none of us had problems until this last week when the problems began again. I made an appointment for another technician to come. The following day, I received a phone call from the support team who told me my connection was healthy and it's pointless to send another technician out. How can I make these folks in India understand that the problems occur at different times of the day and although the connection may be good when talking to them but at other times of the day it is like not having enough broadband. Don't forget, my nieghbours experience the same problems at the same time. On occasions, the internet dies completely but comes back after about 10 or 15 minutes even though the router lights are still on. My last phone call to the support team resulted in them being very abrupt with me and I was given a telephone number which he told me I should call. It turned out to be Xfinity trying to sell me a Protection Plan otherwise I'd have to pay for a technician to come out, which I really don't want as the technician has already told me that the problem isn't within my home. Talking to folks whose first language is not English is terribly difficult especially as everything they say is scripted and they don't listen to what EXACT the problem is.