I did not consent to a credit/affordability check. This is a ****

I have been seeing weird credit checks on my credit report for the past year so I decided to monitor it. Today I got a call from someone offering to lower my debt, I refused. When I got off the call, I received an sms confirming that I authorised a credit review. I did not authorise anything, I could barely hear the agent. I see that this is a common thing, from reading other reviews. What can we do to stop this company from doing this? Enquiries on our credit affects our credit scores. This is infuriating!!!