Unauthorized debit from clientele

Clientele people once stopped me in the street wanting to recruit me as one of them and in the midst of that they asked me to join clientele but I declined knowing that I am only a student and don’t understand any of the things, I get monthly debits of R250, why I don’t know.

I want to cancel whatever it is they have signed me up on and please reverse my R250 because I did not agree to any of that nor was a contract and no such thing as contact from them to show what it is I have entered into