Closing a cancel request

[rxfaith]

A buyer accidentally purchased an item from me twice, but only wanted one and so I wanted to cancel the second purchase.  The buyer is not too familiar with ebay (hence the double purchase) and so I aked them to accept the cancellation request but they are unsure of how to do so.  Is there any other way around this?  Can I cancel my "cancelation request" and do an unpaid item case instead?  Just want my final value fee credit back.