Calling multiple times between 9pm - 1am.. scam

I called back and I received a recorded message advising that they couldn't take my call and to leave a message (no company name provided).

I hung up and called back to receive a recorded message advising that my call will be answered shortly however no company name was provided.

They are now calling me back however I won't be answering them - if it's that's important, they can leave a message.