Billing increased from $45 to $95 in two months

Xfinity charged me for an Apple Watch service that never worked for over two years. I contacted them twice last March to resolve the issue, and they offered me $45 monthly home internet for five years. Last month, I changed my debit card to a credit card for automatic payments, yet they increased the fee to $55. They claimed that the credit card could purchase anything, but if people don’t have good credit with the bank, how can they set up auto payments? How can they still have the credit card? The credit card is meant to protect against fraud, yet Xfinity charged me $95 for a contract that was supposed to be $45. As a loyal customer since moving into this apartment, I believe they don't care about me. I called the online service today; the agent said he could reduce it to $70. He also mentioned he couldn’t see anything on the Xfinity website and didn't have access to his own company’s website. What does that mean? You work for Xfinity and don't know your own online offers? This is horrible customer service—something I’ve never experienced with other companies.