scram and lier，it will aim for your variations items listing . As everybody knows, on ebay variations items listing, if you did not choose any item in the scroll down menu,the default price showing there is the cheapest item. But that item could be sold out when buyer visit your item page.
But once buyer choose one of the item,ebay would show buyer the actual price of the item he choosed,so he can decide if he want to buy.
But this buyer call that is scram and lie.
As far as we see, he is more likely a scramer,due to his Arrogant attitude，He should have successfully scammed other sellers
He is professional，he aim for your variations items listing ，wait for the cheapest item to be sold out，than send message to you，saying you are scam him，because all the item he can choose is not the default price，so he call that is a lie. Some weak sellers may sell him at low cost. If you not agree to sell him the item at the lower price,he will buy it any way,and open case and negative feedback you.

All sellers,Please NOTE, that is how ebay display variations items listing，Not your fault.
You don't need to be friendly to such buyers. We suggest you block him no matter if he contact you or visit your store.
Because Even if you can contact ebay to maintain your own rights, it will also waste you a lot of time. So please do your best to prevent him from buying anything in your store.