Vodacom and Samsung - Incompetance and bad service

As a client using Vodacom for years I am extremely disappointed and so angry towards Vodacom for their incompetence at the national Repair centre in Jhb. I bought a Samsung Galaxy in 2015 -the phone gives me endless problems whilst not even a year old. My phone has been in and out at Vodacom George - every time stating there is no fault. Eventually booking it in on 9 Jan '16 to go to Vodacom Repair centre in Jhb. Receiving my phone back on the 23 Jan just to get the feedback \nothing wrong". With the consultant saying...you must use it again and if it still has a fault we just have to re-book it again - going through the entire process AGAIN after being away for 2 weeks! The more I say I will not take it back because I have been through this process since August last year"