Thanks for your post.
If you are trying to contact Seller Support you can do so through your seller account. You need to click on this link [Get support |https://sellercentral.amazon.co.uk/hz/contact-us?encoding=UTF8&ref=xx_forum_foot_contactus&urlStr=%2Fgp] and then select the most appropriate option from the list and you should have an option for a phone contact. You enter your phone number and you will be called back.
If you are trying to contact the Customer Services team you can do this through your buyer account by clicking on help and the ‘Need More Help?’ option in the table at the end of the page and then ‘Contact Us’. You need to select the most appropriate options and then in the +How would you like to contact us?+ section you can select phone.
I hope this helps.