contract cancelled

i app**** for contract with Vodacom for 3G SMART TAB, it was delivered to me, upon receipt i discovered that the sim card that was sent was incorrect, i called them and spoke to Makgabo who was so unhelpful and rude, i then requested to cancel this contract and arranged collection, until today they have not collected and they have billed me . i have received invoices of the money that will be deducted from my account end of the month for something that is waiting for collection.<br> <br> i am so ****ed off as i can not deal with *********** people, can some please sort this mess and refund my money back!!!!!!