****, agents refusing to cancel contracts - 3 months in arrears due to poor staff not cancelling the contract

Appalling service. I have been trying to cancel my contract since August last year. Eventually, I spoke to a cancellation consultant. in which she had **** and tried to **** me into not canceling the contract. I have 4 numbers that I wanted to be canceled. She only canceled one. I received a bill in November to pay for my contracts that I thought I canceled. I called another cancellation agent and he managed to cancel one of the other numbers. December I received a bill again that I'm now two months in arrears. I cant cancel the contract as I'm in arrear. I have spoken to almost every agent at the cancelation department. We are now in January that will result in me being three months in arrears. One of the agents even mentioned that I must just pay the account and she can cancel the training. I have requested to chat with the manager on every call. To date, I have escalated my issues 9 times and waiting for the manager to call me. The problem is they all working from home so they cant transfer the call. They have an internal message system but that message system seems to be useless just like the signal we getting. I believe half my calls are not logged onto their CRM as they have no ability to see that I had just called the day before. "GDPR" I won't stop until I officially get to chat to someone that has the authority to pull rank. I will also be requested all my calls as I have that right. ****ed off to the max as this issue has affected my credit scoring.