A package which was ordered to me went missing. Who is to blame?!Watch
But judging by your question, you didn’t and they delivered to the neighbour for their own ease. If that’s the case, contact the seller. The seller has the contract with the deliverer, not you. You have rights under the Consumer Rights Act which state that the SELLER is responsible for the goods until they are delivered to YOU. If you didn’t nominate your neighbour, then the goods are not deemed to be delivered and it is their responsibility to locate the items or refund the purchase cost.