Do not leave FB as yet.  Never know the items may still arrive, and you need to take into account the whole transaction.

Whyever not? wjo cares if it arrives now, the seller should have provided valid tracking or a refund long before this and no matter what happens afterward if I have to open a dispute to get a seller to do the right thing then they deserve a neg.

OP if you are able I would escalate to a claim if you don't have a refund within 48 hours.