MTN Staff members opening *****ulent account to their friends, using client's profile

I have asked MTN numerous times to change my payment method from debit order to cash payment, as my profile was a victim of *****, this request has been declined despite fear that my account will be debited again for a contract that I never took. This request has gone in vain; I am appealing to management to please change my payment mode to cash, I cannot pay for a contract that I don't have due to your staff - members opening *****ulent account, without verification. Please assist, I will be taking the matter to the Ombudsman if not resolved.