An unknown error occurred (5002) in Shopping Cart

I've e-mailed Apple tech. support, and they just keep giving me generic answers.

For the past 2 months, I have been unable to view my shopping cart. I've tried this on 4 different PCs/internet connections, so it can't be that. I'm sure there's something wrong on the server, or some misconfiguration of my shopping cart server side.

Anyhow, does anyone know of a workaround, a way to fix this, a way to get in touch with real tech. support and not people who treat you like an idiot?