It's a robo call. If you call it back, it will claim that all their representatives are busy right now. That they will call again in 24 hours. If you think this call was in error, please press 5 to be placed on our do not call list.
Well you know, if they used the Do Not Call list, I wouldn't have these flipping calls in the early hours of the morning. Since they have no clue, just block them. Save yourself the aggravation and headache.