Order cancelled by eBay

[jonro_22]

EBay have an issue with a buyer so cancelled their order from me. The item was already sent first class Royal Mail and I can’t stop the delivery. What is the next step as I can’t seem to get past the bot on messages 

[**peaseblossom**]

Not sure what can be done now the item has been sent but you can contact ebay about it using callback on here:
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid

[jonro_22]

Thank you. Getting hold of a person seems impossible.