Although there may not be anything "technically" you can do about it, I believe that you can report such activity (especially if there is correspondence between you and and a seller via the eBay messaging center that is then "on record" and thus available to access by eBay to back up your claim) because it is NOT representative of good seller methods and standards that eBay professes to uphold AND they are VERY buyer "bias" at this point in time.
It certainly couldn't hurt. eBay DOES have the ability to suspend seller's for periods of time for many different reasons if they deem that the seller is not acting in the best interest of eBay and it's buyers. Trust me -- I know people it has happened to for MUCH less than what you are describing here.
Good luck!