I have to agree with Whale, Just at first glance there are so many elements in place in the various by-laws and agreements that all that’s required is an independent arbitrator with a sophisticated understanding of strata law to untangle all the claims and counter claims and come up with a mutually acceptable solution. The best person to do that would be a strata lawyer.
I also sense that you are rapidly moving to a position where you wan to “win” rather than get a workable outcome. That’s a natural response when you feel frustrated, but it’s not a sound basis for happy community living.
Agree with the lift owners to pay for an independent lawyer to mediate rather than litigate and then sort it all out.