Vodacom untrusted

So Vodacom has been debited my account for the last two months for a Contract that expired. when I called them to cancelled they said that they will debited my account again end of the month as I need to give them 30 day notice, my question then was why do i have to pay every month still if vodacom has not send me my airtime and data for the last two month that they debited my account, the consultant then said they will fix it and i will receive my airtime and Data in 72HR . today its 3weeks already and still nothing from vodacom.