Streets Ahead Croydon

I lived on aa flat for a year that was under the management of Streets Ahead estate agents, and the only thing I cannot complain about it that they DO respond to your inquiries, HOWEVER, they don't do anything for the tenant. Whatever you ask them, their only response is "yes, sorry..but this is how it is" whereas I believe the agency is supposed to be a good communicator between the property manager/landlord and the tenant. I have moved out of the property 20 days ago, the new tenant has moved in, and I still haven't received my deposit and all I get is "you have to wait" - why couldn't THEY wait for the deposit if it was the other way round? Not good!