Faulty product and Bad service

I bought a new S10 on the 5th of April. When I wanted to use the SD for the first time it didn't read the SD card at all. On taking the phone back to Vodacom 4U in Brits mall, they said it will take 21 working days for repairs - That is longer than I have had the phone. I am really upset that I was given a faulty phone and now I will be inconvenienced by the repairs on a phone that was supposed to be functional when I bought it.

On top of that, the Vodacom Shop said that they were off line and could only book my phone manually. That involved writing my details on a piece of paper and handing me a note torn out of a notebook to say that they have accepted the phone. On following up today, 2 May, they say that they are still off line and haven't even sent the phone away for repairs yet.