Terrible service from MTN

I bought a brand new Samsung s10e through MTN Business. After 2 months the phone stopped working properly and was booked into the repair center. It has been 5 weeks and still no response. I've called in and requested feedback on numerous occasions and haven't received any response. Every time I ask to speak to a supervisor, the person is either "busy and will call back" which they never do or they put me on hold with the call simply ending after a few minutes of them wasting my airtime. Absolutely pathetic service from MTN.