called several times without leaving any messages

I didn't find a message from them. They called several times.

Called once, no message

Called twice. Was told to hold for an important phone call. The person on the other line referred themselves as "Mr. Brown from A.R.S.", and then hung up.

I don't think they left a message on my phone, but my kid had erased messages by the time I came home.  If it sounds like a sales or collection call, she knows I don't want to hear it anyway.  I don't know if this is collections or something else, lately I've been getting a lot of "your warranty is expiring soon calls" and debt solution calls.