incorrect billing by vodacom

Had i dispute on my account, tried to sort it out with the call service, after been cut off after 30 min by an unhelpfull agent I was told by the manger on my second call after 30 min that se will phone me back but her agent must go now they are busy. to date no call, I emaild her and no answer. been a client since1995 and have a very good record paying, but now you cut my line after I tried to sort it out. believe you me I am moving . Surelly after nearly 30 Vodacom dont need my bussinees anymore.