Lying and bad service

I had a really bad experience at PG Autoglass today. I was meant to get the windscreen replaced at PG Autoglass Noordhoek Satellite office. They said it would take one or two hours and they would call me when it was done. I phoned up 4 hours later and they said it would be ready in an hour. I then called an hour later and they said they had **** to me and had not even started the work as they had had a problem with another car. So I then went to collect the car, and asked them whether the windscreen was even there. He manager then **** to me and said yes. I asked to see the glass and he then confessed that it was still in the Bakkie and back in Tokai branch (Noordhoek is just a satellite branch of Tokai). They only do fitment in Noordhoek on a Monday and Tuesday, and I would now have to go to Tokai to get it fitted - or wait until next week for Noordhoek. I have now tried to call Tokai to see if they have even got the windscreen - but they do not answer - and it is only 3.30pm on a Tuesday!! So now I have no idea how to get my windscreen replaced! Absolute ****!!