You should have received your refund within hours after you escalated the Dispute to a Claim and indicated that the seller was NARU (Not a Registered User).
Did you escalate?
Call customer service. Pee first, and have a beverage and good book handy. You could be on Hold a long time.
They are right at the top of the page under Help and Contact. You start with the online form and eventually get a phone number and PIN.
Have all your dates and transaction numbers handy. The person you speak with may be in the Phillippines and have English as a second or third language. Or you may get someone in Utah, who doesn't understand confusing concepts like "Canada".
If you get nowhere with that, call the 1-800 number on your credit card (PP is just a useful mediator)and ask the customer service clerk about a chargeback.