I live on a private managed estate and pay subs for the upkeep of the common grounds these.?

These areas mostly are designated play areas these are all areas owned by all of us in the estate, recently signs have gone up stateing no ball games, and the children are being challenged by the management of the company when they do , we have not been consulted as to what we feel to having these areas changed in any way. any advice can they do this etc etc

the areas are not owned by the management they are owned by all residents, the management company was voted in by us to look after all things associated with our estate. they are not our landlords just fellow residents.

If this is common ground I assume that it is under the rules of your subdivision charter. If you have an association that employs the management company then you should be directing them on making rules. Each member of your estate should have a vote on rules of the common area. If you all agree, you can fire the maintenance company and contract with another one.

Check your contract. If the owners are moving the goalposts you can take them to law.

" if enough of you feel the same way , you will have the power to challenge the people that own the estate "

Check the terms of your lease and the contract for the management.

A Privately Managed Estate is normally administered by a Committee. Such Committee is usually made up of people who keep the area in good order, cut the grass etc and also a representative(s) of the residents.
Any resident's Representative would have been elected by the Residents and serve for a designated term.
If the area is owned by you, your will is paramount and any interference is not enforceable.
I suspect, however, that your Deeds will show the true picture and if these are still with the lender, a copy can be obtained for a small fee. It is possible that the Management Company has a clause inserted covering this matter. Good Luck.