Even though you collected the items yourself, you can still open a return as long as you paid through Ebay.
Start a return and the seller will then be able to offer you a partial refund or they will have to arrange for all of the items to be returned (at their expense) and give you a full refund.
Use this link to start a return.
Open a return request
To request a return, select the item you want to send back from your recent purchases above, or use the button below. You can also start a return request from your Purchases in My eBay.
Start a return - opens in new window or tab
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)