No telling how they got your number, but if I were you I would look up Trans-Union or Experian on the internet (both are credit report agencies) and file a fraud alert asap. That will put a higher level of security on any credit transactions you (or anyone else) tries to make.
It's free and you get a free credit report out of it too.
It don't mean a thing, if you aint got that swing!!
'S Rioghal Mo Dhream - a child of the mist