poor customer service

Good Day

I have a complaint with PEP Store at Bethlehem in High Street. I recently purchased a Sumsung A2 which I was told that it is a dual sim. Ever since I bought the phone, it has not been able to take the second sim. I am a full time student at Vaal University and I use the phone for online studies. I was only able to return the phone a month later once I was done with the assignments and classes. To my surprise I was told I had to wait a month for the phone to come back and I told them that I could not wait that long as I don't have an alternative phone and when I purchased the phone no one spoke to me about returning the phone within seven days. They told me that those are store policies and I should know that. I came back after two days asking for the manager of PEP and explained my problem. She made a call and made me speak to a lady who was very rude to me and she told me that she will not speak further with me as I am very difficult and fail to understand that there is nothing they will do, I just have to wait for my phone.