********* behaviour by Vodacom

My cellphone contract ended on the 30th of January 2021. I contacted Vodacom at the beginning of January to give notice of cancellation of the contract and to change my number to pre-paid. I was told that I should phone towards end of January. On the 28th of January I contacted Vodacom and requested a consultant to cancel my contract, change it to prepaid and not to extend it on a month-to-month basis. I was told that the number will be changed to pre-paid as from the 31st of January. On the 29th of January, I phoned Vodacom again just to check if my request has been approved and my number will changed to prepaid. A guy by the name of Andile informed me that indeed my number will be changed to prepaid on the 31st of January. Today, the 1st of February I'm surprised that Vodacom has loaded airtime on my cellphone number. This is ********* and I would like Vodacom to retract their airtime because I do not need it. I will not even use it.