Suspended servive due to credit limit 3 months in

For the past three months my services were suspended on the 9th of each month due to credit limit issues. Every month after numerous telephone calls the suspension is lifted only to be suspended at the 9th of the next month. I have had my account with MTN in excess of 15 years and pay by debit order and not once did not pay my account in full. This is forcing me to refrain from renewing any contract with MTN and I will recommend other clients do the same until they realise that their actions are not the way to handle loyal customers.