Struggling for two months to cancel my account

As per instruction I've sent an email to [Email Removed] asking for a cancellation of my fixed line. 11 Days later got a response that the account first has to be released by the internet service provider. This was subsequently done 3 days later. Now I cannot get hold of Telkom also cannot get feedback after filling all the forms and sending numerous emails. Two months later and I just received an invoice from Telkom for November. I also cannot get through to the customer service line since my cellphone cuts out after 10 minutes of waiting to speak to a customer service consultant.