Here's an idea, why don't you just pack them up nicely with all the original packaging & accessories, in the original box box, well padded, head down to the post office tomorrow and ship it back to them using a service that provides a tracking number and then stop worrying about it.
You already filed a dispute with your credit card company, most likely they will tell you to return it and then you get your money back.
So get that done, you can show them proof of delivery for the items received back and then the guys at the place that sold them will most likely decide to go ahead and refund you and call it a day since you'll get a refund either way if you show it was delivered back.
The whole, "I'm going to contact everyone and so on and so forth," really...
Unless you are really bored, you pretty much could have this already resolved for the most part and be on with your day doing something profitable and you probably would never buy from them again and they would probably never sell to you again and nobody else would actually care all that much.
You should see how much stuff we get shipped in with issues and have to correct or send back, half the time I don't even bother having to go over it with them, just pack it up, ship it back and send them an e-mail letting them know what the issue was and the tracking number I returned it with and asking for a refund when they get it.
