Poor service

On the 18th of December I took a contract for a blackberry Z3 at MTN (East gate). I got a confirming message that I can return to the store to fetch the phone. When I got there on Fri I was told that they have no stock, they will order it so I will get it on Saturday or Sunday 20th. I returned to the store on Sunday after not being contacted to find the guy that helped me not at work, my details were taken and promised to be contacted before 6pm on the same day but no one bothered to get back to me. On Mon 21 Dec I called them again and left my details but no one bothered to reply again. today I went there but Matimu promised to speak to the manager so I can get the phone because its unavailable in the other stores but its been 5 hours he hasn't called me to explain. I've had it with MTN