We live in a private rented property. Last night I was upstairs in the bedroom when I heard the loudest crash and bang. Obviously went to investigate absolutely petrified thinking somebody had bricked our window, to find our glass shower screen had exploded. Glass covering every single surface in the bathroom and it had travelled outside all over the landing carpet. Thankfully our 3 year old DS was nowhere near at the time.
Me and DH spent the best part of an hour cleaning up as best as we could. I was shaken up just because I was so shocked and the noise was so, so loud.
Anyway, I reported it to my letting agent who has told us that the landlord will not be paying for the cost of a replacement and has blamed us for the damage.
For context, just over 12 months ago our oven door also shattered which he did replace. Another freak incident which we just couldn't explain. We have not damaged the shower screen in any way and now we are being told it is our fault and he is suspicious because of the oven door incident. He's said we either pay now or he deducts the money from our deposit at the end of the tenancy agreement 
I have no idea if we are being completely unreasonable in saying we do not want to pay for the replacement as it wasn't our fault.
AIBU?