Poor Service

On February 2015 i bought Samsung S4 Mini and it was packaged from MTN then it happens that the first week of August 2015 my phone stops charging then i took it in for repairs then they booked the phone in and send it to MTN..In October i went to go check if my phone is back from repairs because i dont hear anything from them so apparently MTN send the phone back without being repaired saying it has to be send to Samsumg which is not my problem and they never told me that when i was buying the phone. The phone has been send to samsung for repairs but even today there is no one who can tell me the story about my phone wheather has been fixed or cant be repaired they all tell me they will do follow up on that but it is been too long almost 4 months now and it shows i will reach 2016 without my phone because even today they cant give me an answer about and also leaves me with no choice but to end up taking legal action..