I've been in court and I've fought HOA's before. My advice it not fight them over this based on my general experience. I know it's frustrating but if you fight them, they will likely run up thousands of dollars in attorneys fees and it will be up to the judge to decide who wins or loses. If you don't pay they will shift the fees to your property and eventually try to foreclose on your property. I really can't say anything positive about fighting an HOA. The law is written in their favor and it's absolutely not worth it, especially when your home is on the line if you lose. Just get everything in writing and send everything certified mail.
My comments are not legal advice and are for informational purposes only.