FNB NOT GOOD TO CLIENTS

i have an account with fnb which everything goes well then i joined their life insurance which i was paying R68.00 monthly so in january 2018 i have sent email to them to cancel my policy then someone called me to confirm if i really want to cancel and i said yes then February 2018 they deducted my monies and i reversed it stating that i have cancelled the contract then i was called to be told it will not happen again then now in April 2018 they took 3deductions and got angry i called and sent emails then their client who is Clinton Hendricks called me and told me that i will not get my money and he doesnt have proof that i have sent so he wants proof and i told him i have changed employment so i dont have proof of those mails so now i am so fed up with FNB and i want to cancel my current account as well coz they reaping us off