Telkom Mobile Billing department incompetence!

Telkom and specifically their billing department are incapable of keeping track of any payments made and just randomly deduct funds in the beginning, middle or end of the month and never stick the agreed contract debit order date. Then even if your account is 100% up to date, they still just randomly suspend your line. This level of competence can't even be called a "joke" because at least a joke makes you laugh. My account is in credit but my number is suspended, please explain that Telkom?