Unsolicited automated calls

I regularly receive automated voice calls originating from different extensions - when trying to call MSA on the 021 number available on internet searches, the automated answering system doesn't do anything other than stating my call will be answered.

I would like to make a point here - if I wanted to be under debt review, I will find a services provider.

I find it utterly disgusting to receive such ongoing, automated calls that change the extension when I block the number using anti-spam software.

1 - Where did MSA obtain my number? 2 - Why am I receiving unsolicited calls? 3 - How do I stop it?

Who can I report this poor practice to?

MSA - if you read this, presumably you wouldn't, but if you do, please just don't phone me again. And if you do phone me again, I sincerely hope I get to speak to a person, and to the person I end up speaking to, I apologize in advance for what I am going to utter.