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This is the best resource about seller support https://pirscapital.com/blog/step-by-step-guide-how-to-contact-a-seller-on-amazon/ ever. I recommend to go through it carefully and make sure you will get all information required. It it the most essential resource according to my perception about the topic. So, highly recommended by the way
1) Visit the 'Your Orders' section on the Amazon homepage.
2) Find the relevant order for the item you ordered.
3) It should say 'Contact Seller' on the right next to the item
3) See who the 'seller' is on the order page and click on their name
4) This will take you to their seller page where you can find the button marked 'Contact Seller' and their registered address