Pathetic service

I bought an iPhone se from MTN Clearwater on 22 September 2020 and within a week the cable stopped working. I took it back only to be told that the warranty is only phone the cellphone and not the cable. How can this be if I phone the supplier of the phone provides a warranty for the charger as well. I have had to spend R500 extra for a cable and I’m sitting with a brand new Cable that’s not working. I store was also suprised at why MTN would refuse to take the cable back as it’s still brand new.