Twitch hacked?

As I have just seen, my twitch account for over 400 euro bits bought which I have not bought myself. Does anyone know how to go ahead and if there's a chance to get the money back? They were bought on 1 October and yesterday 17:11 on payment in the collection process

Let the account lock / delete. I do not know if you can claim the money back - you can tell the support that the payment was not authorized by you. But you probably will not get the money back.