Service suspended

My wife was phoned by Telkom, since she is always paying this account, to go onto a debit order. This she has done in June 2017. Since then, we keep on getting sms's to say the account has not been paid, although we receive the confirmation sms's. After a visit to Telkom every time and the promise that this has been fixed, our account has now been suspended. Since we all know how difficult it is to contact Telkom and how inaccessible they are, I hope I can use this avenue to fix whatever is broken.