A member has accused me of misrepresenting the item in the Q&A

Hi there Geoff, yeah this sucks when this happens, you have a few options here Pal

1) Just ignore it, and dont respond ( not the best, but still an idea)

2) Answer the question and politly explain how they are wrong, or how they have misunderstood your listing. Prove that you know what you are talking about, and perhaps quickly explain your process for aging the item. - Turn it into an opportunity to further promote your listing. 

3) Do a comunity watch report - Say " I am reporting my own listing, the comment made by user ... is an attempt at trolling to try and derail my auction, can you guys remove it for me please?" and then put them on your blacklist so they cannot further pester you.

4) Try saying the same thing using the Live Chat option

5) You could take the auction down and rewrite your listing, although this intails a fee, as well as annoying any legit potential buyers.

If you are going to respond and call B.S on it, dont go to def-con 3 and come across aggressive, be polite, friendly almost appoligetic, (but never admit fault) and black list them! The Q & A section is for legit questions, or helpful/useful comments, it is not a discussion forum. 

And most importantly, dont let some Troll ruin your day or selling experience. 

Thank you so much Simon very helpful