Issues with a buyer

Hi, i recently sold a pair of brand new trainers. Buyer received the shoes and then requested a refund. In the pictures he provided, the shoes look worn - as in hes worn them outside and is now claiming they were not new. I contacted vinted saying i have a video of myself packing the brand new shoes.

Vinted said they had approved the refund. I then sent pictures showing that he had worn them and now they've said to wait 5 working days (no reply as of yet). Seller is now pressuring me to accept the return and is being vulgar over text. Is there any advice anybody can give me on this?