Can condo association assess unit twice over roofing repair?

When we purchased our condos in 2008, there was a special roofing assessment, which was paid off from the seller's proceeds so we would not be burdened with this additional monthly charge. This was shown in the HUS statement. The condo association is threatening/proposing to now impose a special roofing assessment on everyone, saying the hoa loan expired and they have to extend the loan. Is it legal and Can they assess a roofing assessment on you if it was paid off at closing?