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I'm sorry to hear about what has happened to your headphones! If they've been through the wash and are no longer working, it is quite likely that they have sustained water damage. You can leave them to dry out and see if this allows you to start using them again, they may not recover.
If leaving them to dry out does not work, what you will want to do is reach out to your local support team as they will be able to help you look into getting them replaced. You can find the contact information for the UK team HERE.