Issue listing products due to previous violation by another brand

Hi,

A few months ago I tried to list a number of new products from our range, I found that another retailer was using our barcode numbers that my brand owns the license for. After some back and forth with support, the products were removed. However, now when I try to add my products, the system tells me that I am unable to do so because there is conflicting information (the EAN is still associated with the offending products). I sought help from support again, who told me to accept the existing values and then once the listing was in our catalogue, to update it with the correct information. I did this, but now the item pages are removed and I can not edit or list our products.

Does anyone have any suggestions to overcome this or experienced anything similar?

Thank you!