MTN new Debit order policy????

I have had an MTN account for 24 years and did EFT's for over 15 years. My contract had to be renewed and MTN INSISTED that a debit order must be done. I have on numerous times contacted MTN asking for them to change back to EFT as it is convenient, knowing that the account is paid and my company pay my salary as they get money in. Yet MTN refuse to change back my account to EFT after 24 years of loyalty, and 15 years of accounts being paid on in and on time. Everytime a debit order does not go off, MTN charge me R116.36 and including R100.00 from the bank. This is a total of R216.36 out of MY pocket due to these STUPID debit order. Money for groceries.

Can MTN sort this out, due to the fact that I only get paid when the company does have the capital to pay the staff. It save embarrassment for my and their staff and unnecessarily bank charges for me.