After you file

Hello, my return was electronically filed and accepted May 10.  I inadvertently had my refund applied to next year's estimated taxes.  I am doing research re having a refund issued now instead.  I called the IRS and was told that the agent had never heard of having a credit changed to a refund check and was not able to assist me.  My question is, should I do an amended tax return with Form 1040-X to change election to refund?  Thank you for your assistance.