Truly pathetic after sales

On the 11th of August 2025, I complained on Hello Peter about a phone purchased not 7 days prior that was not working. Cell C then reached out a couple of days later and collected the phone 14 days after. I specifically told them ( cell c hello peter consultant ) multiple times that we don't want the phone fixed but replaced as it is our right under the consumer protection act but we were ignored point blank, I further told the repair centre the same but without scheduling a delivery proceeded to deliver the same phone, no report, no nothing. The returned phone started freezing not a week later.

WHAT MUST WE DO TO GET A REPLACEMENT PHONE