I live in the UK and thought I set up a UK seller account. Why can I only sell to US, Canada and Mexico?

The last couple of days I’ve been setting up my Amazon seller account to create some income on the side of my day job. I live in the UK and thought that I had set up my seller account for the UK too. Today i gained access to properly log in and I noticed that the website said my only markets were US, Canada and Mexico. Also Amazon had charged £43 on my credit card (which I thought should’ve only been £25 for the UK fee) I am confused, I’ve been struggling with the set up as I don’t have a laptop and have only been using my phone but I’m 100% sure that I set up as UK as I selected that option many times throughout the set up. I am not able to contact Amazon through the seller website because it rings an American number and I don’t want to pay international phone charges. What do I do?