If it's the one I think it is on eBay, there is a contact us button at the bottom of the advert page.
The address on the ad is actually the Ltd Co.'s registered address, and the phone number looks like it's elsewhere, but no-one van be sure of that these days with number portability and auto call forwarding etc.
The company seems to exist off eBay, and may be worth contacting them via their web page.
It depends on whether you want to keep the item, return it, or get a partial refund, since it's not as described.
I'd suggest though that all contact is made via ebay's messaging system, as then it's logged that you have asked the company to correct their error formally. before invoking eBay's "not as described" process, which is likely to find in your favour.
Depending on how long you're prepared to wait, there's always this one at a similar price.
https://www.ebay.co.uk/itm/304361523049
Bill