POOR SERVICE AND UNACCEPTABLE CONDUCT AND THEFT

I bought "STK Mobile" on the 07 July 2017 at ACKERMANS MEADOWDALE, by mid August the phone could not charge at all and we had to return the phone back to the store since the phone is new in the market and we could not purchase the battery elsewhere. when we took the phone back they demanded the original packaging and we packaged the phone and everything that came with the phone and took it back in for repairs. The problem with the phone was a battery that could not last or charge, i know it they knew it but what is shocking is they removed everything in the phone. wiped away my pictures and apps that i downloaded with so much data, to top it all they scratched my phone badly, returned the phone without the screen protector and the phone cover. i mean this phone is new in the market, where on earth will i find the phone cover and protector? why take it in the first place is that not theft? phone is badly scratched just to replace the phone battery and even better the battery still dont last. what does this mean, i have to take back my phone for another 21days???????????? this is highly not acceptable, i really want refund for this NONSENSE OF A PHONE.