Big ****** stole my original phone battery

Please Stay away from these people<br> <br> Saturday 26..03.2016 I went to Eastgate Mall then I saw this Gizmo Lab guys with a big MACBOOK I thought maybe they might be reasonable. I gave them my IPhone 5 c to fix my LCD with a quotation of R1300, They said I should give them 2 hours. 15 minutes later I get a call that they miss quoted me its actually R1700 to fix it, then I said I don't have that kind of money I said I will come get my phone. Few minutes later they call and said its fine they will fix it with R1300 I said its ok. An hour later I fetch my phone it was working but when I got home the phone started to switch off whenever I go to an app. On Tuesday I decided to take it back they asked me to leave it and fetch it the following day when I fetched it they told me I need to but a battery for R550 I said when I dropped my phone on Saturday there was nothing wrong with my battery it was only my screen the lady who was helping also agreed with me, they asked me to give them 30 minutes which I did and I then after collected and it was off but my screen was not lifting anymore but the phone was off was only told to charge it that is should be fine to my phone still not working.