Poor service

We took I contract last year in September 2019 MTN Port Alfred,In March 2020 it went 4 repairs at MTN report Alfred, returned in May even though it was not working properly it had no signal, it freezes at times or just automatically powers off. The speaker was also not working. I took it to MTN Beacon Bay Branch/East london & Vincent branchbut they couldnt help me and advised i go to the Port Alfred store we we bought it. We sent an e-mail to complaint last week to Mtn but still no response received. I have been inconvenienced from March until now & Im paying contract premium every month for services I don't even use, either this issue gets resolved immediately by replacing the phone and getting back my premiums i have paid for the months i have inconvenienced for, not cancel my contract business clearly MTN doesn't know how to do business nor treat their customers.