eBay cannot work on messages or feedbacks, as they could be coming from a disgruntled buyer, or even a competitor.
eBay work on cases.
Did you open a case for item not as described, citing Item Does Not Match Description or Photos? This then, if you're not refunded on time, gives the seller a damaging defect.
Numerous cases opened for the same reason, raises red flags to eBay, and they can then take serious action, sanctions even bans on the seller's account.
Feedback doesn't work, cases do.
@gt970