This number just started showing up yesterday, however they have called 7 times already. They have not left any messages. It could be a collector, but for some reason I'm not so sure that it is. I can't find out any information about them. If anyone has actually spoke to someone on the other end, please leave a comment here of who it's from.
I'm having the same experience. Their message center is full. I have tried calling them. I have recorded them an corresponding auto dial times. I know a lawyer who might be willing to take them on.
Reading through other comments on this site, I have found the number listed in a post under another number. It seems that this number is in fact from the collection agency, NCO.