Bad workmanship

I booked an appointment with PG Glass Midrand (Friday), I went there on the day only to be told that the glass ordered was not the correct one.. I then agreed to go on Monday, I was assisted but they left a mark on my car …..2 weeks after the windscreen replacement, now car is has a leak on the passenger side (I have had my car for 2 years now and I have never had such a problem) …