they debited my account and disabled my card

I had a contract with cellc which they were debiting my account on the 15th of every month. off which they load bundles on the 1st of every month and they expired on month end. upon cancelling the contract. they disabled my bundles on the 15th which they were supposed to be disabled for the month end. and they have debited my account on the same day they have debited it.my question is why are they debiting if they disable my account. I want my money back or my bundles.i phoned their customer center on surtaday.i was given a case number and told the backoffice will call me latest by Monday. its Tuesday today nothing.