Liberty is refusing to cancel my policy.

In March I requested for Liberty life to cancel my policy. A lady by the name of Tshepiso Rantsie called me to confirm my request & further sent me an email advising me on the options that I have other than cancellation. I responded and confirmed that I want to cancel the policy & for the debit order to be stopped. In the month of March, this was not done so I sent a further email to Tshepiso asking why my account is still being debited but I did not get a response. In April the same thing happened & I emailed to follow up again & further copied ********** to escalate. That still yielded no results. It's May now & an even larger some than before has been debited by Liberty from my account without my consent. I want a refund of all the.debits done on my account since March including any further costs that I have incurred due to liberty's negligence in attending to my request.