Promotional Billing Issue

I reached out to Xfinity via chat on 02/12 and asked about lowering my bill. I was offered a promotional plan that included 150 channels, unlimited data plan with device rental for internet and a mobile plan with iPad for $155 per month if I added the mobile plan. I confirmed with the agent multiple times if they were sure that all of this was included for only $155, even taxes and fees. They told me yes. I activated the mobile plan on 02/15. I checked my bill today and it was $186 for internet and tv and the mobile bill isn’t ready yet but projected to be around $65. I went back on chat on 02/19 to ask about this and the agent informed me that the promotion was not originally added to my account and that they were adding it and I’d see a reduction in my bill the next day. Today 02/20 I checked and the bill had not changed. I went back on chat again and was dropped 4 times by 4 different agents so I finally called. When I called I was transferred 3 times and finally someone helped me reduce this months tv and internet bill down to $155 however they did not see any promotion on my account either. The mobile bill still shows $65. I want to make sure that moving forward that both my internet/TV and mobile bill do not exceed a total of $155 per month as promised by the person who offered me this promotion. The original chat transcript is available as proof. Thank you