Xfinity Scam

I called Xfinity as of July 2nd to renew my promotional value for JUST WIFI. I spoke to a representative by the name of Janet and she stated that I would be getting the same wifi speed for a promotional value of $77. I was content and advised that I would like this promotion. She later responded that she needed a payment of $120 to secure the promotion. I told her to use the card stored on the account and she advised that she cannot see it and needs me to provide it. I clearly advised that I did not feel comfortable giving her my payment form over the phone and she ASSURED me that there would be no issues, as this is Xfinity and they do not do scams or fraud. So I provided the credit card information, I receive a text from a 321 number confirming to make a payment to xfinity for $120. I typed in yes and she provided me a confirmation number. I have already confirmed that it was taken out of my bank account and posted as of July 3rd. I look in my emails and received an email from Xfinity for the INCORRECT WIFI SPEED. I called Xfinity again and they updated the wifi and proceeded to send me the equipment. My next bill should have reflected $75.23, however when I check my bill, it shows that I owe $187! To my astonishment I called them again, only for them to tell me that my bank rejected the payment and to call my bank. So i called my bank and they confirmed it was cleared since July 3rd and nothing has been rejected. I called xfinity again and they opened a claim. I uploaded my bank statement, text messages between the representative and I, as well as the confirmation number. They closed the ticket and stated that they would refund the $120 to the account that payed. I checked the payment and the account that they will be refunding was that of a CHECKING ACCOUNT that I did NOT own! I advised that I payed with a CREDIT CARD and uploaded my bank statement reflecting the payment and correct account number. They stated that they have NO recollection of MY credit card payment, only that of the CHECKING ACCOUNT THAT I DO NOT OWN. They stated that although they had my bank statement showing that the payment was taken out of MY CREDIT CARD, they had no statement from them showing that they ever took money from my card. Notified me to call my bank to dispute the charge and that they cannot do anything for me. So basically, I call Xfinity to update my service and they scammed me out of $120 and they have no recollection nor need to help me. I advised that one of THEIR employees are at fault and to go back to the RECORDED voice call that I made on July 2nd and they said THEY HAD NO RECOLLECTION OF THE CALL EITHER, it showed that I never called… I pleaded with them to open an investigation to find this employee and they said they do not have the capability to do so! WHAT?! SO YOUR EMPLOYEE CAN COMMIT FRAUD AND YOU GUYS HELP HER DO IT?! I’m so upset and have absolutely no hope for this company anymore.