Att charged 199$ for iphone 5s when I didn't have an upgrade?

Title explains it but I'm so happy why did it do this?

The only way to find out why is to ask ATT.

If you did not upgrade but were charged you need to get aholdof AT&T and there billing department as either a mistake was made or someone got ahold of your AT&T account.

Make sure they DO NOT transfer you to Apple.