Xfinity support

I am having an absolutely disappointing experience with Xfinity.  I was promised  $500 Gift Card ( one for each line with Xfinity mobile) and I switched 6 of our lines from another provider to Xfinity.  I still haven't received it  after almost 3 months and the agents on the phone are very rude and denying it outright saying there was  no such promotion, even though it was clearly mentioned on the phone while I established service for mobile as well as internet. 
silly me decided to add to this account and agreed to the free watch promotion. I was told I would get a credit for the fee I was charged of $150 because the code provided didn’t work   So I paid the fee and was only refunded a tax fee. Please do the needful and correct thing to  resolve this at the earliest.