A very frustrated customer

December 2018 I bought a phone cash at Truworths canal walk. after a few weeks, the phone did no want to switch on. in January I took it back for repairs, Then in June/July I went back to the store as there was no feedback on the matter. I was then told the phone is still in for repairs. I then went back in September where i was told to wait for 30 minutes. I went back after 45 minutes and the phone was still not switching on and they then told me to wait an additional 4 hours. I went to the store manager to ask for a refund as this product was found to be faulty by many customers. The manager refused based on their policy (no refund), then said they would send my phone via post and yet still I have not received the package. I then called the head office and the agent said they would get back to me, I have not yet heard from them. I do not know what else I can do because I've done all that I can and I am still waiting since January. Can someone please assist me?