We have been selling on Amazon since around 2016, we opened our shop with the name Hmhome, all the products are simple gifts made by us from home. When Amazon started to really push Brand registry a few years ago they locked in our products as Hmhome Brand even though we had not applied for intellectual property at that time. This started to cause a problem as we couldn't update our listings ect. So we applied for Hmhome and was denied ownership of this name due to dispute from the much larger company H&M. We continued to sell under Hmhome as we had some nicely positioned listings that we didn't want to lose, we have since registered a different brand name that we are in the process of building.
Last year we noticed some other sellers had gained access to our top 20 listings and started selling our products, we tried to get them removed but had no success. One of the sellers has now changed some of the details on the listing to show that he is manufacturing the items and claims the he is the rightful owner, one of our listings has been deactivated and we are currently trying to prove to Amazon that we are the rightful owner of the product we have listed under Hmhome, Other than being the creator of the original listing in 2019 and years worth of sales we do not have proof of ownership. Is there anything we can do to stop these items being hijacked?