Need to know who it was calling

The company is out of VA, it claims to do fundraising for charieties but their voice mail says their office is only open until 5pm yet I repeatedly kept getting calls after 5pm. If you listen to the message long enough it will give you the option to press a button(2) and hear a list of their charity's or (1)for an option to be placed on a specific DNC list for a charity. The problem is their charity list is between 150 and 200 different organizations, some of which I couldn't even find a contact for on the internet. Personally, I think its a SCAM, my recommendation is to call the number back, listen to the voice mail and make your own decision.