Had a similar incident on board an EK flight from BOM-DXB last year in business class. Stewardess banged the drinks trolley into my seat and an open bottle of red wine ended up in my lap. I was given a laundry slip on board and told to submit it to my local EK office with the dry cleaning receipt. I did so and a cheque arrived in the post together with (rather ironically) 3 bottles of red wine.

If you were not given the laundry slip definitely write to EK.