Vodacom still debiting for services they not rendering

Vodacom has been debiting my account since December for fibre that I'm not even using.i app**** for relocation on December no one assisted me, o then started calling Vodacom every week till early February they decided to assign someone to help, even so, I'm still waiting to be assisted..I sent th.all the documents they requested from me they acknowledge receipt of the documents.im still waiting for my refund as Vodacom doesn't support fibre where I moved to, the person (Tanya ramatlo) who was assistinge said I must phone the Billings department to get my refund I did that on the 18 February as she said I should, on the 25 February Vodacom debited my account again..but I'm still waiting for refund from December..I have tried other form of ways to get assistance like call Vodacom again, I even spoke to them on twitter they can't seem to care about my query..I sent them on twitter all my conversations with Tanya ramatlo their consultant.nothing is happening.. please help me get my refund back