Cancel D/O on my contract without permission

I have multiple problems with Vodacom lately. In March 2015 I received a SMS to inform us that the Contract will increase. But why!!!..... I have signed to a 2 year contract...Although 1 of my 2 contracts is due for an upgrade, it was no use for us, due to there is no Signal were I work. So I have cancelled only the one. The other contract is use by my wife. Since I have cancelled the 1 contract on my name, my debit order was stop & my wife's contract was suspended. She battle to reinstate the debit order repeatedly, spending hours on the phone to the call centre and as well as the Local Vodacom Shop. Each time she thinks the debit order is now reinstated a msg come through. \Your debit has been removed due to multiple unsuccessful payments."She again visit the local Vodacom Shop with prove none was taken out of our bank acc. We are TIRED of this!!!! The call centre advice her to pay the account at ABSA bank in full. So she did!!!!! And we insist to cancel this contract due to poor services.NOW THIS MORNING SUDDENLY THE DEBIT ORDER WORKS and the amount my wife paid in to Vodacom"