Unsolicited SMSes

I am getting unsolicited SMS from Loanfinder SA. They say I qualify for a predetermined amount. On what basis do they do that? What information do they use and where do they obtain it from?<br> <br> I did not give permission for them to send me SMSes. In fact I am registered on the DMA opt out register to which they claim they are members. Also there is no opt out option in the SMS.<br> <br> I want them to tell me where they obtained enough personal information about my finances so that they could qualify me for a substantial loan.