incorrect debit

Good day My contract ended on the 1st March 2016 I then gave notice for it to be cancelled month end March. On the 31st of march my phone had no service till the 2nd April 2016 and called the call centre several times with no help even spoke to The manager on duty Marcelino and he promised to call back but never did. Eventually after two days my phone had service I noticed that the was airtime loaded again I then checked if the contract was cancel and I was told it was so I then thought Vodacom was giving free airtime for the inconvenience they course. To my suprise now on the 25th April a deduction of R264.01 for airtime subscription and 1gig data of which I don't even know about. I want Vodacom to reserve my money back because I'm not willing to pay for their mistakes and system failure I gave them enough time to cancel my contract so it is not my problem that I was loaded with airtime after I had notified Vodacom to cancel my contract. Alternative no: ***