Called twice would not say anything

Got two calls on my cell phone from them today.  One hung up as soon as I answered.  The second just played what sounded like music-on-hold.Thanks for burning my cell minutes.

i called them 2x and get a voice message intercept that the # is disconnected.

called at 11:30 pm and no one was there

received call asked for my social# or drivers license #.
I was very busy and like a dummy blurred out my social number.
I just signed up with txu energy said she was with them. If
I was going to be secondary on account needed the information.

calling to get updated tech information at my location.  I did go through the qwuestions to see what was being asked and was not acked for any phone numbers or addresses.  Questions about IT changes and purchses in the next 24 monthes.  Said NO to everything.

Tried to call back and just got rapid busy signal.