long delay in call, and busy when you try calling back, telemarketer??

I got a call from this number, i don't understand why these people are allowed to call cellphones, this is a telemarketer call.  

Just got a call from this number.  He had such a heavy accent that I didn't understand anything he said, except I think he said the word "computer".  It's a telemarketer alright. Ugh!

Got a call from this number  Wed Nov 06.

Scammer.  East indian accent.  Called claiming he is from VISA and wants to offer lower interest rates.  But then, started asking about the expiry date of our card, my birth date, etc.  I got suspicious and answered no further.  Did call VISA to verify and this was definitely fraud!  Beware!