BEING LIED TO

I called into Xfinity because my router was defective. They had me go into the store for a new rebuilt one. I told them I wanted a new one because I had trouble in the past with defective rebuilt equiptment in the past from Comcast but only had rebuilt available. Of course the one they gave me was also defective. When I called again they told me because I was a customer since 1991 they would give me two new phones free of any charge and they would reduce my internet bill by thirty dollars per month. I asked 3 times if this was true they said yes! I was mailed the two phones in the mail but when I went to the Xfinity store all of a sudden it became 22 dollars a month for 24 months. Now my internet bill came in the mail without the thirty dollar reduction. Luckily I recorded the conversation. The second router works fine. Is this how Comcast does business ??