Rude Emma Mathanjana

I have contact with MTN December the debit my account on the 24th December and my debit date is the 31st the debit order back on the 24th unpaid and i did not get any notification that they debit account second point they debited the wrong amount R288 and debit amount was suppose to be debit R100 so why are the debiting R288 and now in January they say they will debit R589 why we sent a request to with Attachment to MTN querying this and we received a respond from Emma Mathanjana saying to us Please note as per your debit order date , on the 31st when we tried to debit the was insufficient funds from your account . MTN didn't try and debit from your account on the 24th December . A double debit of R589.00 will go off your account .