If you are unhappy with your estate agent and they haven't responded properly you could contact your local trading standards department. (Call your local council).
Also check whether the agent is a member of one of the trade associations
or the Ombudsman for Estate Agents Scheme and complain to them.
Make notes of who you spoke to and what was said. If you don't feel you have been taken seriously then put it in writing. (The member of staff you dealt with might not have spoken responsibly).
If you don't get an adequate response consider contacting the national press.
If you feel you have a legal claim contact your local Citizens Advice Bureau or a solicitor.
Royal Institution of Chartered Surveyors
12 Great George Street
London SW1P 3AD
Tel 020 7222 7000
The Ombudsman for Estate Agents Scheme
4 Bridge Street
Wiltshire SP1 2LX
Tel 01722 333 306
The National Association of Estate Agents
21 Jury Street
Warwick CV34 4EH
Tel 01926 496 800
Estate Agents Problems... end