SPAM - Optaining my info from a "supplier"

I received one of those "want cover for R500" sms's from Clientele, with a friendly I can OPT OUT option. I asked them where they got my info and received this reply:

"Good Day

Thank you for contacting us.

Kindly provide us with the mobile number you were contacted on in order for us to be able to send a request to our IT department to remove it from our data base.

It is important to note that all our data is received from external suppliers.This data is sourced through multiple channels, namely, Credit Bureaus, Public Domain Information and Data Acquisitions.

Please note that other companies who receive their information through the same channels may have your details and you could still be contacted for other promotional campaigns. Therefore, to prevent the same from happening in future, please ensure that your information is listed on the 'Do Not Contact' list.

It is important to note that all our suppliers must adhere to national legislation and their data is checked against the national 'Do Not Contact' list hosted by the DMA. More information on this can be found at www.dmasa.org.

We trust you find this in order, however should you require any further assistance please feel free to contact us again.

Yours sincerely Clientele Online Team"

So basically my info is getting passed around "obtained" without my consent. For starters I will not ever support Clientele ever