Htc Hero Problems ? Phantom Phone Calls And Loads a multipile Texts Msg Sending

Hey Guys last option was to go on here and ask is anyone else having this problem.

I got a htc hero have it a month and its started doing this.

It rings random people in my contacts and leaves no trace in call history.

Other night I was listening to music on it and it was key locked and someone text me saying you rang my phone I said i didn't they said I did I checked history and that said I didn't its happened a good few times.

Also when I text say I text someone they tell me I got that text off you 2 time or 3 time saying that's how many times I sent it.

iI have downloaded different free virus guards from android market and spy ware programs and nothing at all has shown up I'm at a loss.

Also so glad I have free text to all number's or the text problem would cost me a fortune.