MTN is a ****

They just deducted more money from account telling me that the contract has expired now they are charging me whatever, and you find this out after they have debited your account. Whe I called and wanting to cancel they told me even if I can cancel they will still debit my account the following month because it takes 30 days to cancel, they forced me into a zero what what, whatever they can it in that way I won't be debited next month, what kind of nonsense is this?