Simple answer – tell these busybodies on your committee to either issue a Notice To Comply (which will require them to state the by-law you have breached and how you did so) or take you to the CTTT to get an order forcing you to remove the roof (mediation required by law before you go to a hearing) or leave you alone.
In other words, tell them you haven’t done anything wrong then let them make the running.
You will not entertain anything other than a proper approach on an official notice that allows you to argue your case in front of the CTTT.
In fact, you would like an apology for the unnecessary distress this has caused you.
And, if your want to be even more aggressive, tell them that any further threats or orders will be seen as bullying an you wil appaly to the CTTT yourself and have the committee replaced by a statutory strata manager of your choosing.
But maybe you should keep that last shot in your locker for now.