MTN OVERPORT

I have a contract with MTN since 2017, I have upgraded one of my phones in December Infinity Hisence. The phone is now freezing, I went into the branch that I purchased the phone MTN overport city 1 July 2020 . The guy that I normally deal with is Farad he was not in, there was another guy that assisted me, he advised that they could not replace the phone as it is over 6 months old, they wanted me to leave the phone there for repairs for 7 days without giving me a alternative phone, I am a business person that needs my phone. The guy then said that a rep will be in on Monday the 6 July at 9 am. I was there this morning at 9 am iwaited for half and hour and the rep did not show up, I don't have time to sit and wait. I just want a new phone. I was screened but 4 people that came in after me was not screened or sanitized.