Disappointed - Makro

On the 30th of January 2020, I went to Makro in Alberton (New Market Mall) to buy a cell phone. I was assisted by a very helpful lady and I bought Huawei P30 light. However I only switched on the phone late in the evening because I was waiting for my sim swap to be activated. Then I started using the phone the next day. Whilst I was walking to pick 'n pay with my colleague, out of the blue we just heard a man speaking Greek. I got a shock but tried to ignore it. This thing happened now and then and whilst I'm sleeping as well. Because I work long hours and I don't have time to go back to Makro, I waited until the 7th day. I called Makro I was advised by the call center agent to take back the phone. Then I asked my boss if I could leave early. I took the phone to Makro "returns department", they called the lady who assisted me on the 30th and she checked the phone, switched off a few things. Then I left..... The phone did exactly the same thing later and the next day. I called the lady and she said I should take the phone to Voda shop "New Market", to get a report. Then she will exchange the phone or refund me. Then I asked her that as per their "cell phone policy" if I bring back the phone within the 7 days, they will gladly exchange the phone or refund it however she didn't do that. And why should I be the one running around for something that I reported to her within the 7 days???? I went to Voda after a few because of time.... I explained to them what was happening with the phone and what the lady from Makro said "get a report".... The technician updated the software and said the phone should be fine now..... The very next day the phone did exactly the very same thing.... Till to-date..... All I want is the phone to exchanged because I went back to Makro within 7 days. This is so embarrassing.... My phone will be on silent in meetings and out of the blue, you'll just hear this man speaking Greek..

Please help