poor service

I have been trying to get an issue resolved with mtn for almost a year now , as they replaced a handset of mine to somebody else, who was previously an employee of mtn , the replacement was done by a friend of the ex employee as well as an mtn branch member in their musgrave store, i have been emailing boitumelo who always tells me he will give me feedback or but never does , he gave me a contact number for him but even avoids my calls , i have not paid that contract as i do not have the handset he advised me the issue will be investigated and reolved instead mtn has blacklisted me and it is now affecting my job , mtn does not give me assistance nor do they assist after me using hello peter or caLling into the call center cause all i get told is that. Escalated or that mtn is on strike , is there anybody willing or competent to assist me instead of ignoring my calls or lying that thy will get back to me but never does