When the item was cancelled was this done through eBay channels, did eBay send you a message that a refund is being processed? If so refunds go back to original payment source, check there for it, if you pad with a credit card, it will go back to that card account and can take 30 days, so should be there now.
If not, try your payment provider for help with a refund, as 5 weeks is too late now to claim anything under eBay's 30 day MBG, Money Back Guarantee policy.
@country_johno