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http://www.youtube.com/watch?v=-qtrAMK7_Qk&feature=kp

I don't think you have done the wrong thing. I just think that, regardless of the behaviour of the rep, you should do the right thing. Perhaps explain that you didn't notice until you checked the receipt, but now you know and are calling to pay the difference. I'd also tell them you don't...

Check what you actually paid, and if it's incorrect, pay the difference. Doing the right thing improves our world, one little bit at a time.