I wonder what the reasoning is that PayPal allows you to 'send' someone $0.00?
I'm not really surprised at how terrible the support via Twitter is. I almost never use chat/email support these days with any large company-because of how useless it has become.
I've received invoices for $0.00 when receiving promotional items for projects I was a part of. Comes right in the shipping box, and I'm assuming it's an accounting requirement.
Invoices can contain credits as well as charges. In some cases these might net out to zero but there would still be a legitimate reason to send the invoice showing that detail.
I'm not really surprised at how terrible the support via Twitter is. I almost never use chat/email support these days with any large company-because of how useless it has become.