[FL] and [SFH] Can a HOA double bill for our annual assessment simply by changing the due dates?

We live in a small community of 200 homes. We have always been billed annually. It is an odd set up where each property's due date is the date the home was originally sold by the developer. If the home was originally sold in June, for example, your due dates are June to June of the next year. Our annual assessment letter states June of this year thru June of the following year.

The HOA wants to change all the due dates to January. They claim that while we THOUGHT we were paying into half of the next year, we were actually only paying for the current year. That in essence, the first six months of the year, we were living here for 'free.'

This is clearly ridiculous. Especially since everyone's closing statements when they bought or sold their home clearly shows the HOA fees are paid for the upcoming 12 months, not the past 12 months.

This is especially agregious for those homeowners whose annual due date is late in the year, like December, for example ... that they have to turn around and pay for another full year in January.

What recourse do we have, other than refusing to pay for the months in in the new year that we know we already paid. They will then claim they can charge us for delinquent payment.