DISSATIFIED SERVICE

My S4 went in for repairs about two weeks ago, and was informed that the phone would be ready for collection Monday the 11th May and that they will call me to collect however Monday had passed and no phone call, Tuesday passed and still no contact but then Wednesday came and I really needed my phone by then because I am partially blind and do all my business on this phone because i am able to adjust the font to read my emails. I was instructed that I will need to buy a new battery at the cost of R 550 because the old one had seen better days, Seeing that I am a pensioner this really was a shocking price and no proper explaination as to why I required a new battery, nevertheless I paid for this with my credit card. Friday I collected my phone and upon collection, my phone had still been messed up. They guy said he upgraded the software because it needed to be done and that was the reason for my phone giving issues, He said all I needed to do was charge my phone until its full and everything would be fine. But that evening I did charge my phone but it wouldnt charge and I called them and informed them about it and no response. Their service is terrible and I have wasted R550