Phone plan

I got an internet plan that included a free phone and free service for a year. Comcast sent me a phone with a number and stated that all I would have to pay right. The phone kept getting suspended due to lack of payment. Because comcast claimed that I owed money for the free phone. When I try to call Comcast customer service to get an understanding of the situation, they told me that I and d was entitled to a free phone and that it was an error on their part that I should not have been charged. They credited my account and the service was restored. The service was again Suspended, and when I try to find the reason why Comcast now stated that the plan that I had was that buy one, get 1 free plan that was never told to me. So now I have a phone that Comcast is stating that I am responsible for in a past due bill. When I called corporate to try to reiterate to them. That this was not what I was told when I signed up for or the plan, they stated to me that this was the plan. And that all they could do was take back the phone. This is unacceptable.This is not how you do business.