Depends if it's just slightly low or a slap. I slap would be a QS 1-3. It's not going to be possible to recover from a slap, your only option would be putting the campaign on a new account and on a new domain ( you need a landing page).
If your QS is 4+; then you can still bring it up. You're first step would have to be setting up a landing page.
The landing page probably already has been slapped by a previous affiliate running the offer. You're going to borrow his shitty QS immediately as soon as you type in their domain.