Payment decline on Comcast end

My credit card keeps saying "Card declined" on Xifinity website. I tried Apple Pay and same message" I even tried to pay with checking account and same issue. I have a $49.01 balance due July 31 and today is July 4. No one has been able to help me and I was on the phone with Comcast today for over an hour and on chat for over one hour also talking to 5 different people and still NO help. I will NOT pay a late fee if it comes down to that! Also the agent over the phone said they see numerous pending charges for $49.01 and I contacted my credit card company and they do NOT see any attempt on my card for $49.01. 

I feel like a lawsuit should be started and will be talking to my lawyer in the morning. I have recorded all calls and printed all chats for evidence!