I finally answered one of these calls since they never left a message. The guy identified himself as from the ASPCA, requesting assistance with mailouts. Very nice guy, however, the calls just keep coming! I don't answer anymore.
Received many calls from this number, never leaving a message. When I finally answered, a man asked for my husband and when I said he wasn't available he said he'd call back later and hung up before I could even ask what it was regarding. Seemed like a very suspicious call, which is why I tried searching it on Google! I see I'm not the only one getting these weird calls.