Useless phone

I went to the cell c shop during December with anticipation of taking the Samsung A5 or Samsung J5. An huawei sales rep persuaded me to taking the huawei P8 lite. My phone started giving me problems from the 5th day of purchase. Unfortunately I was unable to go into the store on the 5th day to return the phone due to me having to be at work. When I did go to the store 11 days after the purchase I was told that my phone cannot be replaced due to the guarantee being over. I was then told to come back in January or else i wouldn't have a phone over the December period. The assistant just formatted my phone as it was a display problem and I had to redownload all my apps. I spent over r200 buying data again. My phone is still giving me so much more problems like not being able to download images or songs from the internet. It heats up when it charges causing my glass screen guard to crack and the battery doesn't even last me for more the 3 hours without having to charge it again. And despite so much of problems I am unable to get a new phone. This wasn't even the phone I wanted in the first place!!! Really wish to cancel this contract!..to many regrets. I'm not a happy customer!!!