Yes, as owners, you should be invited to the meeting 14 days before it happens & should have an agenda & know what you are being asked to vote for.
Our builder, many moons ago, also upped sticks & left us a bit in the lurch, though fortunately, it was during the winter, so no problems ensuring pool was maintained etc. None of us got a refund for monies paid in advance & because it was comparatively small beer, nobody could be bothered to go down the legal route & spend their holidays for the next umpteen years, pursuing anything through the courts.
Without a written agreement, you are probably on a hiding to nothing.
If the builder has already stopped maintaining the pool / grounds etc & as it's still mid season you will perhaps have to go with what's available, but ensure that the contract has a review date built in, so if you're not happy with the service, you have time to find your own alternative.
In the meantime, I strongly urge the owners on your site to form a legally recognised management committee in order to take control of all things relating to the site. PM me if you need details of how this should be done