Poor Service - Ccelgro

I bought a house from a developer by the name of Ccelgro, they were very friendly,professional and helpful in the beginning. As soon as the bank transferred the funds they forgot about me. Whenever I call them with queries they ignored my calls and the lady that I used to deal with told me that I shod not contact her as her responsibility ends when one moved into the house. They didn't give me all the documentation that I was supposed to receive from them, the house is cracking and leaking . When I call them to ask them to come and fix it they do not come back. I am very upset with this company and I wish I know how unprofessional they would turn to. I have spent a lot of money paying fines at the council, fixing the house etc.