Wanta bet? That's the way it is supposed to be, but if you pay off all but the contested charge, they will charge interest on the contested charge, and then the next month when you don't pay it, they will charge a late fee and interest, etc. You should get it back, but in the mean time your credit rating goes down and the interest rate increases. And you may not get it back and sure as hell the credit rating and the interest rate won't change back. In my case, one of the personnel flatly told me that I would not get the interest and the late charges reversed.
But enough of this, that's my story. Others may have had better responses from their credit card company. I no longer trust a credit card. I use to also trust the legal system until I sat in a traffic court (and other small legal wrangles) for several hours on different days. What I saw of the various judges, lying to and misleading defendants about what they (the judge) might do, ruined whatever faith I ever had in the courts. And of course the county public defenders, were no help at all to the defendant. BTW, I'm talking about cases where the defendant may have done something illegal but very minor and was no threat to anyone except maybe some policeman(woman)'s macho image. Oh, well, better leave that one alone.