Question... Host claims we broke microwave... 2 weeks later!!!

I stayed at a cabin in Gatlinburg/ Pigeon Forge 2 weeks ago, today I see the host is saying we broke the microwave today. We ate out the whole time we were there except one night we grilled and had cold side dishes ( macaroni salad and potatoe salad). There were only my wife and 2 kids and myself at the cabin. The kids had their own area and rarely came to the main part of the cabin. They never used the microwave. We never used the microwave. I actually brought my own espresso machine for the stay. If I or anyone had used the microwave or broke anything we would have notified the host immediately to correct the problem.

Anyway she is saying we broke it 2 weeks later, the day after I submitted a review, which was 5 stars as that was our overall experience with the host and the property.

We only used a few coffee mugs, glasses, and 5 plates which we ran the dishwasher and made sure to wash the towels before we left.

I was contacted by Airbnb asking questions and I explained exactly like I said here that we didn't use it at all. They said I should have taken pictures before and after...... Why the F.... Didn't they tell us this before ever rented the space.

Is there anything we can do about this or are we stuck paying for something we never used/ more importantly we definitely didn't break