Help needed how to change my brand name from Generic

Hi, I created my listing before I got brand enrolled
So in listing brand name is Generic

Now I am amazon brand enrolled, but I can not change from Generic to my actual brand name, getting ERROR as following

The value ‘SVIND’ specified cannot be used as it conflicts with the value ‘Generic’ for ASIN Z in the Amazon catalogue. If this is ASIN ‘B09Y5PL78D’, update the value to match the ASIN data. If this is a different product, update identifying information (UPC/EAN/Part Number/etc).

I tried to open a case, but I am getting answers to delete my existing listing and create a new one.

That would be ok with me, but when I did it, my ASIN changed

But the main problem is that I give amazon barcodes for my manufacturers and my product is already in transit on the way to the Amazon warehouse.

Any advice?

Thank you in advance