Install of windscreen

The service I get from Alberton pg glass is really bad. What happened I went there last week to install my car glass windscreen I got to there late,but they tool my car in to install it all of a sudden my car was taken out coz there was someone who had appoint at that time which I acknowledge that I was late, made another appointment same time which I was fine with. So on the day of my appointment I went the following week got there the windscreen was not there which I could not understand coz the they send me confirmation message before the actual day. The whites guy who is the one helping me all these time ask if I could arrange another day coz the don't have the glass then I told him I won't come there three times since it's not my me who is late or wrong they should make sure they come to my place to install it and side he will call me Monday which he never did today is the day we agreed on had to call him 2 twice to ask on what time they will come since in the Moy saying he will call me back still waiting now I have to cancel my thing to just wait for time which don't know these person who is coming to install my screen which I paid full. And I feel like these guy is very rude and arrogant and ****** because last when I got there the white person got attend quick Coz is white.as I speak now I'm still waiting for call since in the morning.