As soon as you answer the phone hangs up. Probably a scam number checking for who will pick up the phone. Block them

they called my work place.
After a pause, i heard a beep, which means we are being transferred to a telemarketer
so i hung up

Credit Corp. Block this number.

I called the number back and received a voice message saying my call could not be put through at this time and to ring back.

A male voice with an Indian accent asking me if I have noticed any problem with the charges on my recent electricity account. I said 'no' and they hung up.