It'd be nice to hear from Support. I know it gives you some options as to which backup to restore, but I'm never really sure if they're even there or not. Which restore method did you use? Adding the date to the old tables, new tables, or straight replacement?
I've only done complete restores from the panel, but I keep my own backups as well, so I try not to rely on their backups. While backups are a "feature," they're not guaranteed and are there only for our convenience. As a convenience, they've worked for me, but I never depend on them.