No culpability for their customer service

I am so tired of xfinity not taking any responsibility for what their agents say and do.  I spoke to an agent last Friday on the phone about an arrangement.  When I called back I was told the amount was not correct and that I would have to pay double that to keep my service active.  I mentioned speaking to the agent and what she said and was told there was no notes so it could not have happened.  I was in contact with an agent yesterday and she/he did not fix the issue caused by the agent and just gave me a $30 credit and said the service would be suspended again today.  Then asked if I wanted to review my products to make sure I was getting the right deal…seriously?!  Take some responsibility for the information that your agent provided!  Why else would the calls be recorded?!