So I bought a pair of trainers from a seller on Vinted, but I didn't pay him on the app I paid the seller via PayPal because he said it was easier that way, he then sent it to Royal Mail and then gave me a tracking number to obviously track the trainers. However, when I type in the number, Royal Mail says that an update hasn't been provided, and they haven't attempted to deliver the item yet. The problem is that it has been saying this for nearly a week now and there's been no change. The seller claims to have sent it first class, and I'm getting worried that I may have been scammed and the trainers never got sent