I have tried to get in contact with Ground Rent fo...

I have tried to get in contact with Ground Rent for months. I am wondering if this is a real company at all. They sent me an immediate automated response telling me I would receive a reply 'within 5 working days', but I never heard from them again. Also, all apartment within the building they manage are deemed unsellable, due to a claus in Homeground's contract. They are refusing to respond to the home-owners regarding this issue!