Bad customer service from Cellucity Cavendish Square

Went to look for a phone at Cellucity that gives good quality in pictures and functions well for the amount of R2500. Salesman came with a Cubot at amount of 2200 I think, we were taken by the look of it and he came back with another Cubot X18 amount R2900. I asked, isn't safe to go with known brands eg. Samsung, Nokia & Huawei. He then recommended this one to be of same level as the known brands. Eventually we bought it but only to find out the pictures are not good at all having a 16mp, front camera 13mp, the phone is heating battery doesn't even last a day. The warranty they tell you by mouth nothing written and I was too about a monthly return out of the box failure. Now its a struggle to get a refund bought it 4 May returned it 8 June the phone is not damaged its a factory fault I even showed the manager at the store that the phone gives poor pictures. I event struggle to get a hold of her when I call she doesn't come to the phone immediately. Spent 2 weeks not knowing what's happening about the phone ever since the phone was sent away until I called in to find out for myself. There's alot of stories nothing seems fair and honest even from the beginning nothing was fair and honest, maybe they know that this phones isn't of good quality but they sell it any way and when they have to refund you they give you problems. Last time I spoke to the manager she promised to get back to me Friday last week 22 June if not then 25 Monday 2018 until now nothing, yesterday went there in person they said she left already. I don't know why they cant give me a refund, a full refund I don't want an exchange because clearly they don't respect and value me as a customer so why should they keep my money. I'm sick and tired of this. From what I know I should've been given an option to choose from a variety of phones that they sell of the amount I stated but I trusted the guy. Even thought to myself is it because I'm black that I should receive such treatment. I must lose out for something that is a problem of theirs not mine.