Shocking Service

I had my windscreen replaced through my insurance at Glasfit Alberton on the 15th February 2016. The windscreen's markings are not the same and it is leaking. they were meant to be at our premises between 9h00 and 10h00 this morning. and are still not here. they do not return calls, make all sorts of excuse every time we call, and the staff there do not know the manager's mobile no. When I called the help line, the person there does not have an alternate contact number. I have just had a call from Catherine at the branch and she tells me she does not have to answer my questions. The cell number she has for David the manager does not exist!!! Where to from here????