The seller should pay for the shipping cost, or at least reimburse you, as it was his mistake…not yours. Definitely contact the seller to make arrangements for a fix.
This happened to me once. My feeling was that the seller should pay whatever it cost to make things right, and he agreed. He sent me funds to ship it back, then sent me the correct yoyo.
If you want this deal worked out, you have to cooperate a little bit as well. If he agrees to reimburse you for the shipping, the least you can do is take the time to ship it back. How else do you think this is going to get resolved? Elves and fairies maybe???
Mordo, while it was someone else’s error, we all make mistakes…it was likely a human error. If you are made “whole” in the end by being reimbursed for shipping, it is no real loss to you. Most sellers will include extra string or whatnot for your inconvenience…or even discount you a tad on the originally purchased yo-yo. But, the seller cannot do any of that extra, until he gets the yo-yo back. If you would rather keep the Trinity, you should still notify the seller that you received the wrong yo-yo, that it is a Trinity, and ask him if you can keep it instead. If he says no, you should return it. I almost sense you would rather keep the Trinity. Do you like it?
Same happened with me a while back. I ended up just paying him for the mistakenly shipped yoyo for a very nice price. Pretty much half off retail for a mint condition because he sent the wrong yoyo
BTW I find it very odd that you needed them to pay you more than the cost for shipping when you’re sending out yoyos on a daily basis it seems. Seems like you were taking advantage of them