The 501-448-6635 number called and it was an automated recording, saying "this is a service verification call", and "we will call back later." The recording started with general office noise in the background before the lady starts talking, so they're trying to trick you into thinking someone is on the phone.
This number has called me three times in the last two days. Recording just says "This is a service verification call. We will call you back later. Thank you."
I answered and got the same "this is a service verification and we will call back later". I called and of course no company name is identified only "customer service". The number called my cell phone. I wanted to share something I did to cut down on these interruptions since I use my cell phone as our business line. I created a contact called "DO NOT ANSWER SALES CALL" and anytime I get an unwanted call I add it to this list. I have been doing this for about 10 months now and my list has over 300 numbers on it! I get calls off of the list on an average of 3-6 per day. At least I can just ignore them now! :)