"CWOP" on visa, and extension refused under 221G. Can I travel with this visa to the US?

I recently applied for an F-1 visa extension six months before the expiration of my current visa. However, they refused the extension of my visa under 221g and have also written CWOP on my current visa. My current visa is valid until December and I am scheduled to travel back to the States in two days. Can I travel with the current visa or am I required to obtain a new visa before traveling?

Thanks.