I was charged twice for buying same product

Hi! I bought from the online Apple Store the new Apple Watch series 7 and my debit card has being charged twice 429 euros for the same purchase (once on 2 December and once on 9 December). I also choose the trade in option for my previous Apple Watch. Do you know how I can resolve this and be refunded for the doubled charged amount?

I’ve bought many times from Apple Store but this issue I experienced itfor the first time.