Telkom poor service

We have been trying to cancel our Telkom landline account since November 2019. I even went as far as driving 250 Km to the nearest Telkom outlet to us. Every time I am told to send the paper work to a different e mail address. I have now sent all the relevant documents to four e mail addresses. Still no joy. I am still receiving accounts. I am now refusing to pay them another cent. I is very frustrating. Their call centre can not help just gives me an email address with I already sent the documentation to. No response from any of the mails I send.