Updating Amazon detailed Page Removed ASINs with new GS1 EANs so Reviews and sale record can be saved

Hi, I am an Amazon UK Seller and private brand owner which is registered to Amazon UK. Like many other sellers , we also listed our products to Amazon with EANs that we purchased from eBay etc. Now, Most of our listings inactive on Amazon " detailed page removed " . Now i have GS1 barcodes for those products but i still could not change the old incorrect EANs with new GS1 ones. If i clicked on edit next to it It says " This field cannot be changed once it is submitted. To edit, delete this listing and create a new listing. " I contacted Amazon support through brand registry page in order to get help. I was told that The UPC is currently not associated with any existing ASIN and advised to create new listings with correct EANs which i did and then i asked for old ASINs are merged with new ASINs This time they say " Upon checking the ASIN was recalled from the catalogue, and cannot be reinstated until all sellers have removed their inventory for this ASIN. " This ASIN is belongs to our private brand SIRRI which is registered on Amazon. We are only seller selling this product by FBM. There is no stock in FBA. I have just made the stock 0 for this re-open the case but same response again. Like many other sellers , my main concern is saving the reviews and sales record in my old listings which detailed page removed. I have listings have more than 100 reviews which they were on the top page of amazon in their category. I have got at least 2000 ASINs that i need to change their EANs and get them back sale again with their well-deserved reviews. How can you help me with this ? I really need urgent help. Please advise