Got a call from this number this morning, but I wasn't able to answer in time to listen. No voicemail left.

They are returning a call or request to process or give more info on processing Credit Cards.

Legit.

Got a call from them today. It was Quickbooks asking what address they were going to send my upgraded software to.

We got call, after call, after call from this number.  Annoying!!

I keep getting calls from this number and when I return the phone call they said that there's a message but I have to press something to give me more information about it - sounds like a scam