Loyalty Discount not applied

Hi,

About a month ago I received an email about a loyalty discount that would be applied so that I could keep my promotional rate that was expiring. However now I received a new bill and it does not reflect this discount. My price more than doubled from what I was paying before!

I've also contacted customer support which told me off and questioned if this was a spam mail, which I can assure it is not, as it comes from a verified Comcast email address and mentions date and values specific to my account.

Appreciate any help in getting this discount applied, otherwise this will be my last bill with Xfinity.