Yep, this is bad selling and you can report the seller to Customer Services.
You won the item, did you pay? Then, if the seller cancels citing Buyer Requests to Cancel, this relieves them from any defect, contact CS explain you did not sanction the cancellation and was disappointed not to receive your item.
This is the easiest and quickest way to contact eBay Customer Services, for a Call Back option.
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
Lines open 8 a.m. - 10 p.m. on weekdays
9 a.m. - 6 p.m. on weekends.
Automated agents will be available on chat outside of the above hours.
I do recommend contacting CS very first thing in the morning, when the lines first open, as there's more chance of Dublin answering.
@padlockb