Can't swap upgrades. How to do so?

I got a new 2$ rebate on my internet. I couldn't use the shake function and swap on two different browsers i tried. So i deactivated one 1$ rebate, thinking it would free the slot. But now it says i have to wait until next month for removal, and then i'll be able to apply the 2$ rebate, which will only be applied the next month after. Kind of complex for nothing. Support ain't helping, saying the techs can't help when this is clearly a simple database parameter. Any way to contact the tech support directly? They even acknowledge this is a well known situation, but they can't contact tech about this supposedly. It's already not worth the 2$ rebate at this point 🤦‍♂️