Complain to Sanlam and Debtbuster

I received a call today on true caller is Sanlam but the email is from debit buster. I failed to understand the link between the two companies and the person I spoke to is Sipho from debtbuster i did not finish the call and he sent me an email I told him that I don't need the offer because I don't want anything to do with debt review.. They must stop calling me and Sanlam did not respect my personal information.