paying for device I do not have

I am billed R400 whereas I have a topup R49 contract with vodacom. Last year October a consultant, phil , in burgersfort made a mistake by upgrading my number and opening a new line for the same device, vodacom smart tab 3g, I raised this with vodacom and it was resolved. But earlier this month i was debited R400 instead of R49. Now i do not understand games plsyed by vodacom.I thought this issue was resolved in may