Call Blocker - more scams

I had one of those stupid, scammer calls about a call blocker yesterday.  They asked me if I wanted to stop getting marketing calls starting tomorrow (wow, sounds too good to be true!).  I try never to say the word Yes to these people, but I wondered what their angle was going to be. I kept asking "So you are going to give me a call blocker for nothing starting tomorrow."  Yes they told me. I tried asking they same question in several different ways but they were not going to change their script.  I eventually got bored and hung up.

They called back and I recognised the number and gave it to The Network Manager.  They wanted to talk to me and not him...hmm did they think I was the soft touch ... we already know its a scam, still trying to work out their angle. 

They called back this morning still wanting to speak to me, but got The Network Manager instead.  He spoke to them and this is what he said.

Decided to hear them out today to see how the scam works. First they say they work for the 'telephone preference' management'' and do you want to stop nuisance calls. Then they tell you your address details and ask you to confirm they are correct. 

Then they tell you the last time you registered with them the card you used had an expiration date of xxx/xxx and was that card still valid or did you have a new card to use. So there you have it, that's the scam. I got bored at that point and put the phone down.  

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So that's the scam...getting your bank card details, "Social Engineering", They have all this info so therefore They must be somehow genuine and you will provide all your details  - NOT!!

Oh Really?

I know this is not a new thing, but I was interested to see what this was about,  what they were up to and how they were going to do it.