Samsung Galaxy A50 "Black screen of death" Horrible service from Cell C, Maynard Mall, Wynberg

Bought a Samsung Galaxy A50. After 6 days the phone went off without warning and was unable to go on again. I ejected my sim card and the phone went on. After about 5 days the phone went blank again and was not responding up until i did i google search and to my surprise it is a known issue "black screen of death" i did a soft reset and the phone responded. My worry is that within the first two weeks of using this phone, this issue happened twice. I take my phone to cell c in Maynard Mall, Wynberg. The manager (didnt get a name) stated that i need to book the phone in for repairs. I was a bit worried as i use my phone daily for work purposes and asked how long it will take, i almost fell off the chair when i heard it would take 20 BUSINESS DAYS, thats nearly 2 months being offline which will obviously affect my business. I asked what about a courtesy phone or loan phone, to my amazement, i was told no. I understand that each company has their processes in order for repairs but for a company to sell a phone with a known issue is very ********* and unfair. This is my 3rd week of owning the phone and i fear daily that the phone will just go blank at any given moment.