HTC Touch Pro2 (CDMA)

I'm having trouble using Call Waiting on Sprint w/this phone. I get the second calls and can "swap " between them but let's say I want to drop one of the calls. There's no way to do that. I have tried it and if you press "end call" *both* calls drop. So I then just switched calls to talk w/the person I wanted to talk with and told the other person to hang up. Well the stupid phone kept the connection up on the party that hung up- it still showed a connection to that party on the call status screen. When I 'swapped' to it long after they had hung up, I got a dial tone from Sprint's switch. This is wack- I've never had a Sprint phone act like this. ☹️

Anyone else experience this?
Any suggestions?