I've been renting an appartement through Altijd Wo...

I've been renting an appartement through Altijd Wonen for the last year.
However, the contact I had with them was not at all what Id expected from an estate agent. They where unprofessional, unreliable and very slow in all their actions. I understand that the housing market is hard, especially in Utrecht, but they did not provide the service they promised in the contract. When I proposed to not pay the full price for their services, they did however agree.