Account Mixed up

It seems that Vodacom only deliver a service when they feel it is now necessary. My account keeps on being moved onto my Fathers name. My question remains how can Vodacom do that without bank statements or any form of consent? To move my account time and again onto my Fathers name is no frustrating me. Spoke to a Vodacom shop and they informed me that I will need to bring in bank statement to move the account that has been on my name for more then 10 years. So again I am asking Vodacom to step up to the plate and deliver the service I pay for !!