If a majority on the Owners Corporation has agreed to the special levy then you have no option but to pay it (however, it should be calculated on unit entitlements, not “per unit”). If you have trouble raising that kind of money, talk to your treasurer and secretary about spreading the payments over several months, hopefully without incurring the 10 percent penalty interest for late payments. Rest assured you will not be the only person in this position.
On the question of the warranty, if the claim has been lodged before it runs out, then the developer or builder still has to address it.