********** deduction of money from my account by vodacom

I have cancelled a contract with vodacom,send back their laptop but now they deduct 9700 from my bank account.I called them several time to inform them that they should stop deducting my money,till today I mnsuffering.How do I pay for the item that I don't have?every time I tell them that I returned the laptop ,they keep on checking the system.the laptop seem to be ****** and never reached vodacom .but fortunately I have proof.I had more than 30 contracts with vodacom,I will never buy from vodacom anymore.They have poor service and lot of ********** activities.customer care poor.never trust any online purchase by vodacom.they are full of ***** and frustration s will follow u should you attempt to buy.i have learned a lesson.never ever