Vodacom over debited my account.

It's been a month where vodacom has since over debited my account and has not payed my refund, instead they keep transferring me pillar to post, I cancelled my contract with them because of this poor service. But I want my money back, it's disgusting how you have handled my account. According to you (vodacom) my refund moved from R3300 to R1700 then R92 I can't even begin to explain how angry. I want my feedback before the end of today