There are two elements to this. The first is to get some stability with your strata managers, the next is to get the right contract.
Some strata managers will charge you a low up-front fee then slug you for every phone call they make or receive, or email they read or send. These are what they call Schedule B charges.
Others will charge you a higher, all-inclusive fee. A few greedy buggers will charge you both.
As far as recommendations go, just scroll to the top of these pages and click on the ad for Strata Choice, our long term sponsors, and have a chat with them about your issues.
Or you could look at a new service that offers to get you five strata management quotes. I have no idea how good it is, but then, how bad could it be?