You could be the victim of fraud or the target of criminal prosecution. Criminals are always seeking new ways to gain access to cash or to use third parties to move property or conceal transactions.
If you are considering buying or selling bitcoin for someone else, consider that you will have no practical recourse if money promised to you as a fee or commission isn't paid or if a cheque or money transfer is cancelled or reversed leaving you with a loss.
Your contact might be a criminal or working for criminals. If you haven't verified their identity and the purpose of their transactions you could be abetting or committing money-laundering, a criminal offence.
Instacoin operates a bitcoin payment service. Like other network providers, Instacoin is not responsible for your actions on the network.
Instacoin cannot help you if you deal with someone or for a purpose that you haven't taken the steps to verify.