Received call, did not answer the unknown number, sent to (cell phone's) voicemail.
Googled the number and found other instances of calls from this number on this website.
This caller left a three (3) minute vague message as if I initiated the call to some unknown call center. The recorded message has a male voice using phrases such as, "your call is very important to us" and to "please stay on the line for the next available agent." Also to press buttons to leave a message, etc. Never mentioned a company name, identification, contact, or callback information.
NO intention of calling them back, deleted message, and blocked the number. Beware, it is probably some sort of scam or scheme to get you to call them back.