Unfair treatment

I bought a cellphone at foschini pavilion on the 26th of November 2017 took the phone back to shop since I was experiencing problems with it I was told it will be back in 6 weeks but till this day I have not received my phone back when I enquire about it (06 January 2018) was told will be contacted if the phone is back two weeks passed heard nothing from them so I decided to go back again was told to wait for their call on the 10th of March 2018 decided to go again and see if the phone was back since there was no call from them the lady by the name Lungi who works at the cellphone counter said they know nothing about my phone since the lady who received it resigned she looked for it and find it with the dummies which means for 3 months the phone was lying there not sent for repairs she (Lungi) will book the phone for repairs and she will call me on Monday 12 March 2018 but she didn't went back to the shop and no one is prepared to help me Kindly assist on this matter