It is very poor selling and eBay do not like unhappy buyers.
The seller used the excuse, ' Buyer requests to Cancel' because this does not give them any penalties or fees to pay. You can if you wish contact eBay Customer Services explain you did not authorise the cancellation and were disappointed not to receive your item. They can place that damaging defect on their account, it doesn't take many to boot a seller off eBay permanently, and charge them a fee based on the highest bid you placed.
You can also leave appropriate feedback.
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.
@matsmedle7