Help with a threatening seller

I need some advice on a stalking seller , my item arrived damaged and long story short he got compensation I got a refund. Vinted told me in their message I can keep the item and not return it since he has been fully compensated. The seller wants to fix the item and resell it which I absolutely do not agree with so I told the seller what vinted said and he threatened to take legal action against me and to track down my address and receive the goods.I blocked and Vinted handled the situation by blocking the user. A week later he posted on a vinted fraud group accusing me of fraud and that I won’t return the item. After he got people to message me I called the police and they gave him a police caution. He has now gone on fb and stated he’s looking to send papers to my work and is tracing it down. What do I do ? He’s in Scotland so he can post anything online without action being taken