Chipped windscreen after service was done!

On Tuesday 10 November,I took my car to Hyundai in Margate to get the 45000km service done.When I returned at 3.30 to pick I up,I had to wait over 2 minutes as the receptionist tried several times to get hold of someone to return my car.After the ridiculous wait, I had to sign papers and my car was pulled around.I got in and by then it started raining.I noticed a mark on my windscreen but thought it was a raindrop of a bug,I then drove up the road and put the wipers on.To my dismay,it did not wipe off.I stopped and noticed that my windscreen was chipped and someone left a fingerprint on it,which tells me that someone knows that this happened.The next morning I phoned Hyundai and was left hanging on the phone for over 5 min while the receptionist was running around up and down stairs to find someone.I was then told they will call me back immediately.3 hours later I phoned back yet again and I was informed that I signed the job card and their insurance won't fix it but they will let me know if I send a picture of the chip.Today I contacted them and was told that they will not fix it. I told this person that I will make this public to warn others and he responded with \Im not worried""";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ***;793949;885771;13;2;0;0;0;0;2;NULL;NULL;NULL;15/11/12 15:17;15/11/12 13:23;Non cancelleation of account;9,11E+12;Accounts;***;I recently got in touch with motor happy for a service plan and spoke to Thato to set up one, but after the setting up within that \30 days\"" grace period of cancellation while i was on the phone with another operator to set up an extended warranty for my car i realized i made duplicates of services and requested that an email or something be forwarded to cancel the policy(service plan) but they never did"