STOP billing me for a cancelled contract!!!!

My contract expired on the 29th of February 2016. Before expiry I phoned Vodacom and cancelled it because I did not want an upgrade. I asked for the number to remain active on prepaid. I was informed I would have to switch off the phone, remove the sim card and battery from 12 midnight and keep it like that for the whole day.<br> <br> I gave them a month notice to cancel the contract but there was a deduction from my account this month and airtime was allocated. When I phoned the cancellation department, the lady told me that my contract was not cancelled and that she cannot do anything about it but to send an email to her team leader to cancel the contract. Which means the contract will run for a further two month because she can't cancel a contract on the 1st of the month.<br> <br> I WANT A REFUND OF MY MONEY!!! <br> <br> This is their fault, not mine. If their employees were efficient in their work, this would not have happened and I will not be held liable for a slacking employee's mistake.<br> <br> PAY BACK MY MONEY VODACOM!!!!!