pay attention to your loyal customers

hi I explained mtn about being a pensioner government has changed pay dates so I asked mtn to change debit date from 2nd to the 5th of each month they came back to me via email stating changes as per my request & all ok today is the 2nd & they debited my account leaving me with a problem cause I had funds to buy pre paid electricity now tomorrow i will be in darkness untill im paid my grant they puss me off now they must get their house in order