Money just dissapearing without any answer or refferances

Good day so this morning i recieved a message from telkom saying that my account is in arears with R1700.00 plus. Last month i paid my account the out standing amount and on the 25th of last month my debit order went off so my account is paid. Now i recieve a message saying my account is in arears and if i do not make a payment my account wil be on hold. Problem is when i go to the telkom shop they say i must phone the billing department and when i phone them they say i must go the the closest telkom shop but not one of these options are doing their job. Telkom takes money out of my account without any refferance they have no proof for what the withdrawel is they have no answers for the money that has been debducted from my account. I want an explaination and they keep ignoring me so now im wrighting a review on helo peter cause it feels like only then someone is doing their job.