First your agent does not need to tell you that you have been ripped off.
Secondly , your agent holds no obligation to tell you u r directly above the flight path.
Thirdly, you are not diligent enough to do your homework.
Ultimately, you have created your own mess.
Dont blame on the agent.
Its buyer's beware
I m not an agent, and faced the same sitiation before. But i quick sold the property after 3 months. The profits from the sold property all went to ppt, , agent fee.
Agents are always on the winning side.