R2000 worth of impaired phone

I purchased my Samsung Galaxy Prime September, I returned it to MTN for repairs. MTN took 4 weeks to repair but nothing was done. The phone has given me the same problem of application failure. No loan phone, no compensation for my loss. No one is taking any responsibility for the impaired phone sold to me neither Samsung nor MTN nor Woolworth Maponya Mall. I have never enjoyed my purchase and I simply want my money back I can not afford running up and down all expenses on me for a phone I bought with my own money ...?? ANGRY CLIENT