Frustrated Customer

I took up a contract for ADSL with Telkom which include wifi and a telephone line, for a 24 months contract. The network was giving me issues from the beginning, I would report but nothing would get done to sort it out and sometimes a technicians would come but the issue would never be resolved. Fast-word to 24 months later I was glad the contract was ending however I had request to keep the telephone line but cancel the wifi service and I was told that this can be done. I noticed that even though I cancelled the contract but I was being billed for something I was not using, the wifi was not working and also the telephone line. I have been reporting this matter with the service provider since 2019 ,as it stands I received a call last week telling me that I owe Telkom a certain amount of money even though I have not been using the wifi or the telephone line for the past two years. This has been really stressful because I have been to my nearest Telkom branch and they would tell me they have logged in a fault, I would get SMS's telling the issue has been sorted out only to find out that I am still being billed for something that I am not even using. I don't know what else to do because I have not received any help from Telkom since the day the contract terminated. This is my last resort before I take it to the lawyers. I hope that my case will be prioritised and resolved as soon as possible.