Bad Service

I booked in my Samsung phone at SSS Cellular on Friday 2 Oct at 11:12. I left my unit over the weekend to be repaired. I called SSS on Monday 05 October to find out how far my repair is. I was told that it would be ready by Tuesday at 12h00. It is now Tuesday, 14h00 and I called in again as have not heard from SSS. Now they tell me that they cannot use my second ADH to replace my mainboard. Why, when I called yesterday did the lady tell me it will be ready today. Now all of a sudden its a different story. She should have told me on Monday regarding the mainboard. I am VERY unhappy with their service and Samsung. I know I am also not the only person experiencing problems with SSS. When I booked in my phone at the old service centre at The Terminal, i had NO issues at all regarding service and repairs. I wish I could go back there.