Poor, slow services with no feedback!

I delivered my Samsung Mini S4 to Samsung to be repaired under warrantee. I delivered it on the 3rd of August. The issue was not too serious but it took repeated (more than 5 phone calls) just to get them to address the real issue of the damaged phone. Every time someone new answered the call they gave me the same story that its the battery and I needed to start again to argue that it was not the battery. They are the experts and should be able to diagnose the problem. And finally they changed the board of the phone and sent it to Durban for some technical issue. That was fine. They sent it two weeks ago and told me it would be back on Friday and they would call me. No one called so I did on monday and was told its back. I went in today to collect it and they cant find it!!! An hour later, after missing an appointment, I left once gain they said they'd call me this morning! Nothing! I'm so frustrated with their poor service and tired of being \desensitized"to general poor service. I wish more could be done and fear that by taking action this issue will not be solved!!! """