Ackermans had bad service I want my phone

I'm so disappointed in Ackermans at Kwa Thema square. I've bought a phone last year on the 10 of July 2020 it gave me problems after a few weeks. I took it back to the store and they took it for repair. Unfortunately I lost my phone which I was contacted to regarding my Nokia C1 but I thought since o gave an alternative number I will be contacted to that number. Since I took my phone for repair last year even today it's not back whenever I go to the store I'm told that MTN it's not answering they phone. My phone was an MTN provider. I'm tired of the stories that I'm told.