I also got a call from this number, from Denver - don't know anyone there, didn't answer. Called back on office phone (multi-lined) and received a recording that stated:
'none of our representatives are available right now, if this is the number you received the call on, you should receive a call back within a day. If you believe you received this call in error, press 5 to be placed on our "DO NOT CALL" list'. I hit '5' and then blocked them on my cell phone as they never told me their company name or any reference. So, if it's really legit - they can mail me something. you would think that they would at least give you a company name.
I got a call from this # too, don't know anybody in Colorado. I have an app called TRUE CALLER, perfect app for determining if caller is legit, if not, block them. The app did its job!! Told me it was a spam caller.
The app is free from GOOGLE PLAY STORE,
you can get some for ANDROID & APPLE PHONES.