OLD MUTUAL LIFE INSURANCE - CANCELLATION REQUEST IGNORED

I took out Life Insurance with Old Mutual 20 September 2022. They deducted the 1st premium on 27 September. The policy clearly states that there is a 30 day "cool-off" period where I can cancel the policy, and they will refund any moneys paid. I emailed them to the email address from where they've send me the policy, as well as customer services (the email address stated in my policy I should mail regarding any queries) on 14 October, requesting cancellation with immediate effect. On 21 October I forwarded the same email again, requesting cancellation. To date I've received no response whatsoever. They keep on sending me sms's to go for a HIV test as not to loose any benefits, I've even rep**** on that sms's to confirm cancellation, but I keep on getting the emails AND sms's, and yesterday they deducted the premium again. Customer Services either don't answer when I call, or I am put on hold for so long, that either the call disconnect after a while of I have to end the call due to time lapse. I've tried to stop/reverse the deduction online on my banking app, but apparently Old Mutual make use of a debit order system where you can't reverse/stop the debit order on your banking app. So if I can't stop/cancel the deduction from my side on my banking app, and they ignore my requests to cancel the policy, what am I to do?? This is highly irregular and unprofessional, and I am extremely upset, this is totally unacceptable.