Imposible to close Account

I have been struggling to close my account with Telkom since January 2017. I have phoned them several times and submitted the cancelation form in person at our Telkom Branch as well as e-mailed it numerous times to several people at the cancelation department only to receive a new bill by email after a while. I have immigrated in May so am now trying to close my account via the website and email. I resubmitted my cancelation form mid October and have not heard anything from Telkom since then. I thought I was rid of the disease, only to be surprised with a new bill and a new amount being demanded in mid February. is their honestly no Way to get rid of Telkom? I have payed my dues please release me!