Received a call from this number. Didn't answer. A short voicemail was left in which you can hear what sounds like someone taking a breath and then nothing for the rest of the voicemails.

I've been receiving calls from different 803-528-XXXX numbers for the past few weeks. I've answered a few and gotten an automated message offering me a free security system or free cruise or some dumb crap. It's likely to be a scam.