Called me on my cell. How can we stop that scum?

It's possible that this is just a stage 1 phishing attempt. They don't identify themselves, and you have the opportunity to hit 1. When you do that they then jot down in their database that you are a possible gullible target, someone to peddle products to. That in itself could actually be their actual product. The whole credit story could just be a story just to measure to see if you respond.
They're just profiling you.
Once you respond, you go into another database and you get sold off to a range of actual other marketing slime.

Received calls on unlisted numbers from this number with a recorded "debt" message

They sadly don't indentify which company they're calling from / on behalf of.One of us will have to have enough courage to hit 1 :)

Recorded message regarding debt management.  It evens leaves messages, uses up my air time.

Just go a call from this number at my office (Fed number in Ottawa). Recorded computer generated message. Just hung up.