My storefront brings a completely blank page. Seller support useless

Over the years, selling on Amazon and keeping all my products visible on the storefront has consistently boosted my sales through effective cross-selling.

2 weeks ago my storefront became completely blank! Sales dropped 65%!

Several cases are still pending, and phone calls prove to be ineffective. Every time I reach out, I'm told that my case needs to be transferred to a "special department," but there's been no resolution so far.

But the very frustrating part is that seller support acting like they have no clue what is "storefront" is:

"Please provide an ASIN that is not visible...."

ALL OF THEM ARE!

Does anyone know how to get through this "wall" and make my storefront show my items?!?