This Person or Animal call me from this number but i try to call back and nobody Answer!! Hate this calls

I got a call today from this number. The man spoke spanish and was Mexican accent (I know this because I am bilingual and know plenty people from Mexico).  The individual did not identify self and said wanted to speak to "the person who sent money to someone in Mexico".  My family did use Western Union the night before to send money to a family member that lives in Mexico...Is Western Union on the Mexico side leaking information????  I am sure this is a scam. Since I did not leave any information nor identified self the person hung up.

This person should be prosecuted. . .

I answered and long pause.  Then man with very heavy accent kept saying something about "computer."  His voice indicated something was wrong so I hung up on him.  Then he called back and I didn't answer.

An East Indian gent called my 85 yr old Grandfather stating something was wrong with his computer. Of course after a long speech, my Grandfather said "where do you get a computer since I don't own one?" Idiot had enough guts to say go to a store and buy one! Grandpa told him to go to hell and hung up the phone.

got 2 unknown calls in a row last night after 9:30...then a "toronto" number showed (416) 364-1114.....i thought it might be a collector call or telemarketing but who in the heck calls at 12:30am?  (i'm on the west coast)