Debid order

Me and my fiancé both have a contract telkom that is under her name but i pay for the contracts. We had a problem with finanses last month and could make the debid order but paid the account a few days later directly into their account. The next week they debit the money from our bank account when money came in. Our debid order date is set for the 5th and then they took again a debid order wich we thought they allready took their money so no funds was in our account for we were waiting for money. Today when money came into our bank account they debid the money more than what our invoice amount is for the second time. So they took extra money on the invoice and we had to pay extra bank fees. Now they are rude when you contact telkom, barely getting any help and full of excuses. Telkom financial department is pathetic and dont know what they are doing. Every time a problem with debid orders. Im realy fed up..!!!