Bad Service after not making me aware of damaging my windscreen

Today I dropped off my car at VW Melrose for service, when I picked up the car they did not tell me theyve hurt my windscreen I see it on my way home, I called them spoke to technician who dealt with my car Blessing, he called me back after an hour saying he will send me his email address so I can send the photo of the cracked windscreen till now I'm still waiting for him contact number, I'm not happy with the service I got they saw what they did because they changed wipers, they did not say anything, I call they do not bother to do the correct thing and send me numbers so I can send the Pic I expect my windscreen to be fixed.