Unprofessional, uncaring incompident

My daughter rented a property through Surelet. One final viewing,she was ensured the remaining work was to be completed. On moving in the property was inhabitable and she and the children had to stay with me until it was cleaned. too numerous faults and issues to mention were found with the property, resulting in numerous un-returned calls or "can't contact landlord". Finally after over a week without heating, because my daughter has two young children, both both weak chests, Environmental Health go involved, and basically found numerous fault including saying third attic bedroom was unsafe!!! The landlord was served papers to do repairs, and none were carried out to standard. It ended with the landlord, because he didn't want to do repairs ending the tenancy, all through the problems, Surelet were uninterested. She looked at another property through them, but they wanted the fees again and would not transfer the deposit!! I know the landlord pays a fee to them, but where is their duty to the tenant, they rented out a house that was not fit to live in, and seem not to care at all or offer any help whatsoever.