matas17

@Cr0-Magnonbeen on a phone for 40min with HMRC and they are contacting customs on my behalf to get that sorted and I also gone send out the notice of claim to them tomorrow.

Something to be absolutely clear on: until the goods are in your hands, they are the property and the responsibility of the seller. That's not your rail that's been seized, it's theirs.  It's been seized because of their decision to mis-declare it. It's their responsibility, not yours, to get it into your hands.

So I'd get on to them and tell them you'll be needing them to do that, or to refund you in full and immediately.

When they inevitably refuse and lie to you about it being your problem, or simply ignore you, then initiate a chargeback via your payment processor.  No need to get into the details with them, just "ordered, not received, seller is refusing to resolve, money back please".  Consumer forums have information on how to do a chargeback, including on debit cards, not just credit cards.

Do this in parallel.  It's better for you to have the rail and your money, than neither.

This is not your fault, it's theirs.

@Rogerborg sent out letter to Border Force with request to get my rail and atm in talks with a seller to get my money back. Funny how the seller is so unprofessional and said "Customs is not my problem" like wtf but he declared it wrong not me.