For the second item if it's still within 30 days of the delivery date start a return on here:
https://www.ebay.co.uk/help/buying/returns-refunds/return-item-refund?id=4041
select "Item doesn't match description" and if necessary escalate it to eBay after 3 complete working days. 

If you want to contact ebay you can ring them or request they ring you on your phone only, not on a laptop or PC.   So view this link on your phone:
https://www.ebay.co.uk/help/eua?id=5190