Who called from 2105510827

I got a call from this number clamming to be a reward company I answered and they didn't want to say anything much??

Most likely originating from outside the U.S.

The person called my number, and did not leave a message. Therefore I will be blocking the call.

just received a call from them came up caller i.d. as service rewards. I do not answer phone calls from anyone that i don't know

This was just one of frequent calls to a non-hunt number in our office.  This one line gets a number of these calls where there is no answer.  A return call receives a recorded message that allows this number to be placed on a Do Not Call list for just 210-551-0827.  Obviously a robo-dialing machine that is up to no good.