Bad bad service

My father passed away in May 2017 and had a Mygig1 contract with Vodacom. To spare my mother from continuing to pay for the contract I went to Vodacom Klerksdorp ( Checkers Hyper Centre) to do a change of ownership of the contract onto my name. I sighned the new contract for the mygig1 bundle ( note without the device as I never took ownership or delivery of any device) just to be shocked at the debit date of the amount Im being charged.... I phoned Vodacom customer care who informed me that I am paying for the device. At one stage I was given a credit on my account as the device was released and the month after that just debited again for the device....After numerous calls to the call centre and having to explain my story every time I am fed up!!!!! Is there any one at Vodacom that can assist me except for *********** call centre agents. Money is being taken from my account without my concent and I consider it to be *****....