Bad customer service received from Cell C Cresta Mall.

I would like to express how unimpressed I am with the service I received from Malvin Kazembe on the 28/December/2019 at Cell C Cresta Mall. I bought a Samsung cellphone on the 22/December/2019. Two days later we noticed that the speaker wasn't clear. Due to work, I wasn't able to take the phone back. Today when I went in, I was unfortunate to be assisted by Malvin Kazembe. He told me that I had two options. Option1: I'd have to book in the phone and the procedure would take up to 21 days. Option2: I could take it to the head office and wait while they fix it. I explained to Malvin that 21 days is a very long time for someone to be without a phone and I opted for option 2. I then asked him if it wouldn't be a problem because on Monday, it would be day 8 already and as per the terms and conditions, I needed to report this within 7 days. Malvin Kazembe then told me not to make him lose his cool. His exact words were "don't make me lose my cool I have just taken my meds" out of shock, I asked him to repeat it and he got up from his chair told me again not to make him lose his cool while pointing his finger at me, I asked him if That's how he treated all the customers and he bluntly said no then he just left me standing there. He got into the store room/safe and locked himself. Luckily Devan (assistance manager) was there, he asked what the problem was and explained to him again. He referred to my case as "catch 22" he advised that I can take the phone to the repair store on day 8 and explain to them that I was at the store on day 6, they can call the store to confirm this. Malvin Kazembe was rude to me because he is a sales consultant and I wasn't there to purchase a product but to report a faulty product. I'll never set foot again at Cell C Cresta because of people like Malvin Kazembe he might have been sick or whatever but that's not an excuse to treat a paying customer like trash.