Poor customer service and wrong information about returns

I bought a cellphone on 20/03/2018 at Mr Price Daveyton Mall and I was told that if is faulty within 7 days from the day of purchase I will get a new phone. The phone was faulty and I returned it on 26/03/2018 and the lady who is working with cellphones told me that the store is about to close and she is off the following day so she will book in the faulty phone when she comes back from her off. I told her about the 7 days period but she said the phone can make calls so it is not totally faulty so she must take it to be checked. I went back to the shop on 07/04/2018 and I was told to come back when Thando was on duty because she is the only person working with cellphones. On the 24/04/2018 I received a message that says my cellphone was booked for repairs with *** and that is a month later after I handed the phone at the Mr Price Daveyton Mall. On the 04/05/2018 I decided to complain on the Mr Price website, I received an automated email saying that my matter was received and it will be attended to shortly, till today I have not heard anything from Mr Price Daveyton Mall or Mr Price customer service. I am very dissatisfied with their customer service and how they feed us lies when we buy cellphones. I paid cash for this cellphone and only used it for 4 days and been to repairs for almost two months now.