Not sure if I'm paranoia but there is this seller on Mercari that started selling the same niche as mine at the beginning of the year. At first, I didn't mind. I even acted as buyer and asked for an item if they had. Throughout the conversation I found out they didn't carry the item but sourcing from China 2nd hand marketpleace and they urged me to buy because Lunar New Year close off. So I stopped my engagement because I didn't want my account got flagged after several messages in that chat were deleted (one of the reason I couldn't keep as proof)
Later, they flooded the niche and I noticed some irregularities same as mine. Items reserved especially for someone but ridiculously high-price and never once appeared on search despite their claim of defects.
I'm a collector of the same niche so I have a lot of items and duplications from gacha, so I passed to recover part of my cost and help me in my hard time. But my items are discontinued and since I got them pulled first hand without use so they are all in NEW condition.
Meanwhile whenever I posted something occasionally 2-3 times a weeks with just 1-2 items, they will flood the search system with 4-10 items to bury my search. A lot of the items are the same as mine but ridiculously lowball price due to "factory defects" and I know there wouldn't be because I inspected a lot from my experience as a collector and NOT Chinese 2nd hand market reseller.
They also created listing of the same items they posted but different quantities.
So I feel a lot like a quiet harassment targetting at me. And recently when I found out they blocked me despite I stopped interacting with them. Just first intend to buy when I need to.
What should I do?w