Valid contract not ****ured by vodacom

My father a pensioner is being treated so badly by Vodacom Somerset Mall branch due to him having a 24 month contract which they refuse to activate . They insist that he gives them his bank details which he refuses as he has already a valid 24 month contract with them and insists on paying the monthly fees by EFT. He has payed them all arrears of more than 1500 rands as requested by them due to falling behind due to not getting his internet working. Going into the shop the management are so rude as to not wanting to assist him , I feel that vodacom should be made to reimburse him his monies he has paid and cancel his contract if they do not want to honor there part of the deal.