Useless Phone

On 31/07/2017 I bought a Mobicell Candy cellphone from PEP. Although the ladies working there were very friendly and helpful, they had no knowledge of the handsets they sell. Two days after I bought the phone I started getting messages saying my internal storage is low and some features of the phone would not work properly. I went back to PEP and the ladies recommended I installed a memory card, which I did (another R100 later) with no results. The ladies showed me a whole bunch of faulty handsets waiting to be picked up by MTN. I went to the MTN shop in Vryburg and asked them for help. They said that this phone will not work with a memory card and that I can not do anything to fix the problem. Now I am stuck with a phone that cannot handle Whatsapp or even more than 3 photos. I would like to change the phone for a more expensive one and pay in the extra money, but PEP will not help me. When I bought the phone, I asked the ladies if it could take good pictures and handle whatsapp. This is all I want from the phone. They assured me that it was capable of these two features. The box even contains a Whatsapp start-up guide. None of this were true. This is really unfair to me and the ladies working at PEP. They do not get any training in the cellphone department and therefore cannot assist buyers properly. The slip you sign on purchase says you had the opportunity to examine the phone and that the features and functionality are relevant to your needs. How can this be true? You are not allowed to open the box before paying and signing this slip. I hope that someone can help me here. I shop at PEP regularly and love their products and the people working there. I just feel that I was given a toy phone for the price of a smart phone. Thank you.