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Under the terms of your Lease, no doubt your Freeholder will be responsible for maintaining the structure and communal parts as well as organising block Buildings Insurance, with the proviso that these costs can be claimed back by you and the other Leaseholders. Correct me if I am wrong, but the Freeholder would usually "farm out" this work to a third party- namely the Maintenance Company.
Therefore, even though the Maintenance Company have decided against continuing with the development, your Freeholder is still liable to perform their obligations under the terms of the Lease. Hence, you do really need to contact the Freeholder if you have concerns.
Looking ahead, if you ar enot happy with th eway the development is being run by the Freeholder, provided you all agree, you residents are entitled to apply
to manage the development yourselves (ie for you all to get together and form a Company which then arranges the maintenance and Buildings Insurance). You do not have to prove that the Freeholder has been negligent before making such an application.
The formal name for this application is "the Right to Manage" and there is plenty of useful information concerning it on the Leasehold Advisory Service website- link here- they can also assist you free of charge concerning any ongoing leasehold queries you may have.
I hope this assists and sets out the legal position to you.