Airtime Contract ****

I had an acc with Mr Price and decided to cancel it last year in September and was advised to come back to request cancellation in October . When I go back to the store in October was advised that the airtime contract will be cancelled end of October. They kept on loading the airtime even though I asked them to cancel the airtime contract and convert my number back to prepaid. Now they busy calling me everyday asking me to pay r260 for airtime that they loaded even though I ask them not to load the airtime anymore but to cancel it...