Yes, you can raise it with eBay as this is very bad selling.
Explain you did not authorise this cancellation, and were very disappointed not to receive your item.
eBay will place a damaging defect on their account. It doesn't take many defects for eBay to remove a seller permanently from their site. eBay do not like unhappy buyers, they tend not to come back to their site to buy.
To contact Customer Services the quickest way is through this link below.
You can select a Live Chat or a Call Back option is available when the lines are not busy.
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
Lines open between 8 a.m. to10 p.m. on weekdays.
9 a.m. to 6 p.m. on weekends
I do recommend contacting very first thing when the lines first open, as there's more chance of Dublin answering.
@choccyfreak1982