Thank you Susan: I indeed have Omni Tech for my computer. They used to call from another number before. So, this is NOT a spam message.

It is a tech support reminder from Omni Tech support if you have bought tech support from this company reminding to leave the computer on so they can come in and check out the system.

I just received a call from this number. I didn't recognize it and a message was not left.

I did not answer the phone because I did not recognize the number.  They did not leave a message.