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Best to have waited and then filed for non receipt of item OR item received but not as described.
You can't cancel a completed payment, if you told paypal it was fraud then you were telling them that you didn't make the transaction and so that is why they opened a dispute for unauthorised for you.
A dispute for an unauthorised transaction is telling paypal that your account was hacked and used without your consent to make that transaction.
Paypal would check IP addresses and devices and close the dispute if it was you that made the transaction.
You are only allowed 1 dispute per transaction so the only way you can get a second dispute opened is to contact Paypal (when and if you can) and see if they will open a second dispute for you.
They may decline citing policies but if you say you made a mistake then they might open a second dispute for you.
If not then if you funded your paypal payment via a credit card then consider contacting your card issuer and see if they will help you with a chargeback?
I had the same situation. I believed that I was scammed, and didn't find the right claim reason except the unauthorized transaction. Paypal denied and closed the claim. How can I reach paypal and open a second dispute? The item of course didn't arrive. There is no way to contact the seller, the seller never responded. Thanks!