Issues logging into Partner Portal

Do you have a partner (Reseller or Provider) that has Admin On Behalf Of access to your tenant? You could ask them to support in reestablishing access to your tenant. 

If not, Microsoft support is the only way. 

I have moved your post to our partner-led tech topics board. I'm sorry for your poor experience with support

Tagging some superusers in case they have any advice: ahart3 MartijnElfers blakecheek