Vox stole my money

I cancelled my contract with Vox, even received confirmation of the cancelation date and that all was in order. End of the month, I was still debited the incorrect amount. When I queried this with Vox, they said a mistake happened with the cancellation on Vumatel's side, they refused to refund me because they paid Vumatel for the services, so I now had to pay. The product manager declined my refund, pathetic service, will never use Vox again.