Pillar to post over screen replacement

I put in a screen replacement claim over two weeks ago. for the two weeks i am sent back and forth between Miway and Glassfit. Glassfit says they don't have the full authorization, Miway insists they gave them the authorization to a point I then request the claim be assigned to a different installer since glassfit are not coming to the party- even that has not materialized. its quite ridiculous that to date I have made no less 10 phone calls between the two companies and to no avail. If a glass replacement requires so much admin what will it take for car to be repaired.