Were you able to quickly quit the stamps.com free trial after you were approved? I'd consider doing that, then a couple more surveys to get over the 22 point hump if it wasn't much of a hassle.
I like to wait a day or so to make sure I get them approved. I canceled the stamps yesterday. I would recommend using your real contact information on any that use credit cards, mainly the True and Stamps one. I just fudged the phone number by one digit (if they ask, I could say I mistyped.) We've all seen the True ads over the years, so I felt pretty confident it was a legit company.
I had to call the stamps one, which took about 5 minutes. Make sure to document everything you use to sign up for that, including your secret question. They'll ask it when you want to cancel. I waited to cancel that one after my prize request was approved. (You know, just to make sure.) The True one I was able to cancel online (even though it says you need to call. I called later, and they told me it was canceled already online. Still can't believe I got denied that one. It still hurts!!)
I'm looking at the efax one as a possibility next, as it's another free 30 day trial for 7.5 points. It says you can cancel via live chat. Like I said, I like waiting a few days. It's easy to just leave yourself a note. It's also hard to forget when you check the site every day.

My charger has shipped, so I'll give you more info if/when I see it, and whether it is the actual Nyko brand.