Unsuccessful cancellation of policy

I received a call today morning from on of their agent and offered me a clientele perks policy which i first refused till he convinced ke into taking the policey claiming that i should try the free voucher, i will not be debted unril next month on the 25th and that i can cancel at anytime . He then asked for my details claiming it's part if the process and that it will be used to bill me on the 25th of July after that he sent a message that he said i should approve quickly before it expires. After i have approved i noticed it was a debit order and i can not stop it nor do anything about it. I called clientele to cancel the policy then I was directed to WhatsApp and when I got to WhatsApp I was redirected to call them again, I then emailed them and they rep**** stating that i should call client customer service again. Yoh, I'm not happy and now I will billed for a service that I don't want and don't need.