If they won't return your calls, you'll have to go to them. But, I'm not too sure on how you stand with the damage, you didn't see it until you had left their premises and I'd imagine they will be within their rights to say it could have happened after you left their premises.
I'd go down and see them and try and be calm about it, ask to see who ever has been dealing with your situation, put your view across and see how it goes from there. Try and find out where you stand legally before you go and see them, better to have the facts before hand.
Goodluck
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