Vodacom poor upgrade lead time

My vodacom contract has been aprooved for upgrade. However the contract is on my mothers name, I pay the contract and I am in possession of the cellphone. When vodacom called my mother for authorisation, she approved however didnt know the address where I am currently staying because I moved in april this year. She asked vodacom to phone her back. We have since tried to call back ourselves, but vodacom says they work down a list they will call her again, we dont have to call. This is 4 days later, really poor service!!! Especially after us trying to make contact from our side numerous times. Mrs C Harrison. ********** 527