unauthorized debit order

I took investment and retirement annuity. sent email to Sanlam to cancel investment and continue with retirement annuity and further gave them new banking details to debit from however I never received any communication from them. They then continued to debit the inactive account which resulted to unpaid debit order fees being charged on my account.

I then received policy documents only to find out there's sanlam sky and i then resend same email and another one requesting them to reverse those unpaid debit order fees and cancel all covers still haven't got any feedback from them. Please refer this to the relevant department.