Unauthorised Debit order by Clientele

I was recently ******* by a Clientele sales person (her name is Asanda), at the taxi rank at back of Cleary Park Shopping Centre, to join the Client Funeral Plan. The lady said we only checking if I qualify for the policy and that I'll soon be contacted by Clientele, in order to tell me more about the policy, and also to confirm if I'm interested. To my surprise, later that day, I received an sms from Clientele, informing me that my account will be debited with R250, without my consent. I tried contacting the customer care service, but had no luck. Can you please help me cancel this policy, because I am unemployed, and I can't afford it.
- Clientele Funeral Plan, Policy number (reference number from debit order): ***.