Bad service

Morning I have a contract with Telkom. That we made a agreement that it would be a debit order every month. But yet that doesn't seem to happen. They don't debit this month then come the second month the double debit me and that's very frustrating and after not debiting they suspend my account because of their negligence that we had a agreement to debit on a specific date but they don't that. Now I have to fight every month to debit my account. They should have just told me to make payments my own way. Now have to fight now every month for them to unsuspend my account because their accounts department is not doing what's meant to be done. Honestly this is frustrating and irritating honestly I'm sick and tired of this