Contract cancelled in beginning of August 2017 the reference received on 13.09.2017

I cancelled my prepaid contract on flexible 110 cover in beginning ofor August 2017. I paid the previous cancellation amount, signed the previous quote submit documents with identification copy and letter stating that I will still keep / use cell phone number. On last day of August debit gonna through my account. I called in on the 13 September to verify that the contract is indeed cancelled the lady assurest me the contract was cancelled sent two reference numbersource 1- ********** ********** and 1- ********** ********** for cancellation and that the quote is processed. Today R471.24 was debited from my account that is double the amount i paid when was still on prepaid contract.I called Vodacom the lady said the contract was only cancelled on 13 September 2017 she gave me another reference number stating I must wait 3-7 days for investigation and my money "might"be reimbursed. Please assist in need My R471.24 in my account and contract to be cancelled !!!!