Cancelling Transactions No LOnger Works??

A buyer bought too many of an item that qualified for combined freight and after combined invoice was sent messaged me asking to cancel two items. So the requests were sent with the reason code of buyer changed mind. Buyer has claimed they have cancelled them the items are still present in the awaiting payment section ( used to disappear after they were cancelled) but showing as cancelled but still appear in a combined invoice and I cant manually remove them?!  ANy ideas other than talking to the customer service minions?