Wrong account debited, service interrupted

I have a contract device with Telkom mobile. I have been paying it by ABSA debit order on the 25th of every month. In June, Telkom went to deduct in a closed FNB, which I didn't supply to them. I received sms informing me that in 48 hrs my line will be disconnected which they did on 22 July. Attempts to get Telkom to reconnect my line failed. When I called the call centre I was told the deduction will only be effective end of August. I am without communication. There is money in my account for the debit order. I am very angry. I want the contract to be cancelled and I will not be paying any cancellation fee. Every month since I took this contract there is always problems with Telkom. I am tired. Keep your F*****KN device. Debit my account with what is due and take back your device. You are very useless.