faulty new cellphone did not work after seven days

Please note that I bought a new cellphone from pepcell festival mall branch in kempton park last month November 2015 and after seven days cellphone was faulty did not accept my password.I then took the cellphone back to the shop today 2015/12/02 and what a bad experience I have received from the shop maybe its because I am black and does not deserve to be treated with respect. Consultant informed me that I can take the cellphone to other shop so that they can repaire or check what's wrong with the phone ,because if they take it back to their repairer it can take months to be repaired.what is a use of buying a new cellphone if no guarantee will be given to me.I am so dissaponted that the shop refuse to give me another and I had to wait for months before I can get my cellphone back, its so sad that my rights as a consumer has been taken for granted by the shop. I think they must inform their client before buying the cellphone that if the cellphone its faulty after seven days then you can wait months before it can be repaired, I should have gone to the other shop and bought the cellphone from them. I am so frustrated that I will be without a cellphone for months and I currently won't