He didn't buy the stock that I had requested.

I found out later on, several days ago when that stock had gone up 20% or so.

Anyone has any experience with this kind issue?

First you must read the terms and condition and their disclaimer when you open the contract with them.

Some brokers won't be responsible with any lost that you have even if it is their mistake.

hope that helps

Usually they have some kind of tape recording in their system. So the tape will record all conversation between client and agent.

First you have to make sure they don't record your conversation or the record says you said to buy that stock clearly

I couldn't agree more with sandy and santana.

You have to make sure you are right or they will sue you back.