Cellphone Samsung J1 Ace

On 3/11/15 I bought a Samsung J1 Ace Cell phone from Edgars in Pretoria North. Before the cell phone was even 1 month old it was already returned to Edgars and sent to MTN Serv department for repairs. When I bought the phone I immediately had a glass cover put on the phone to protect the face of the phone. After the 2nd time the phone was in for repairs, I got the phone back without the glass protection on, the face of the phone not even properly put back together. I can not believe that this is the type of service received. Very very bad. I am a MTN user for almost 15 years or more, this is the 1st time I receive this type of service. I am seriously thinking of moving to another cell phone provider because surely in 1 month a phone in for repairs twice and now for the3rd time. Why can't Edgars check and have this sorted out once and for all. I have to pay my account, but sit with some that is not working correct. Unbelievable.