Who called from 2504125720

no message left

this number calls at least once a day and sometimes twice. Never a msg. and no one there. When I call back a msg. says "your call will be recorded for quality and training purposes".

Same thing.  Did not leave a message on voicemail.

I answered and there was no one there

i got one to but i dont answer numbers i dont recognize , However when it came up there was a line of mixed numbers and letters . Indicating the call came from either a switch bored or a computer.