Pathetic service at this point.

In the beginning of dealing with Teljoy it was an absolute pleasure. But as the time goes by, the service is becoming more and more pathetic. I have sent countless emails explaining that I should be finished with my contract as I was told I would be done paying it off by December of 2023. I was given a reference number when paying, then it was the wrong reference number i was given and i had to send proof of payment. So i RESENT it. It is now March and I am still getting invoices and every month the amount I apparently owe is getting larger. Despite my many emails through to this company I am getting absolutely no response. I got one ONCE that apparently my query was being forwarded to the relevant department and the email was ccd but no one bothered to get back to me. This is such pathetic service which is now affecting my credit score because teljoy quite literally can't be bothered to do their job.