Hi pcostie,
Frank's right at this point your best option is to get hold of eBay support so you can get the entire issue straightened out or at least so they can provide you with a valid explanation as to why your seller ratings keep diving.
I have tried search for any update in case they (eBay) are having issues with their feedback system, but so far found none.
Do keep us posted as to how eBay will resolve this one.
All the best!