False marketing ******* into sale

Based on a sales call from FNB to sell me a life policy that will pay off my bo d if I should die, I took out a policy. The premium has since gone fro R150 to almost R400pm. I call to cancel and am now told that I would need to get permission. From FNB home loans to cancel this? Guys this was a voluntary product I bought. I don’t need anyone’s authority to cancel this.