Unhappy customer

On the 21st of October,I bought a Nokia C2 cellphone from Ackermans at Ballito Junction. During the short time I've had it,I realized that the phone freezes up,it is too slow and the battery gets quickly drained. I could charge the phone over night,have a full battery and wake up to 79 percent battery without even using it at night. I went to the store and tried to explain all of this but they claim they can't help me ifthe phone does not freeze in front of them....as if I can make the phone to freeze on my command. The guys that work there Siyabonga and Palisa were not helpful...All they cared about was the fact that if they take the phone back,it would be a loss to them... Honestly I didn't want even a refund,I just wanted to exchange it and get a phone that would be realiable to work with since I use my phone mostly for work. The guy did admitted that these phones are slow and when I bought that phone,that information wasn't shared with me but instead I was allowed to unknowingly buy a phone that is unrealiable just so they can push sales...I am not happy with this whole thing and how my case was handled. My contact info is ***.