Bad service from Vodacom repairs shop in Eastgate

I took in my samsung phone on the 02January to Vodacom repairs centre Eastgate,it is now the 25th January and I still have not got it back.They don't even call to update me.Two times I have been there to check up on the phone and it still has not been fixed. Their service level agreement is a turnaround of 14 days, it is now 21 days later and I am still waiting. On the 15th I went again to check for an update,I spoke to Soneli who assured me she would call last week and did not call. I still called on the 21st for an update,she said she would be on leave this week but someone would call me today,and I have heard nothing from them. For a screen that takes 3hours to fix at a Samsung shop, has taken over 20 days for Vodacom to fix