Cancel repair request

Idiot I am. I had a charging issue with my in-car setup. I did not have it plugged all the way in and thought my battery was dying on my iPod Classic from 2009. Twice when getting in my car it was totally dead although it stays plugged in all the time. I panicked and set it up to have the battery replaced and then found out it just needed to be plugged in as it was not making contact enough to charge AND play, but just play. DUH!!!! Feel like an idiot. How do i cancel the repair request? They charge your card immediately for the amount so I have been charged. I have not sent it to them yet because their box is on its way to me.