Unfair Termination of Policy

my name is Mbhekiseni, i had a policy with a company called Old Mutual for about 3 years , i had a terrible experience when they stopped debiting their monthly premium without informing me, i then called their call cetre (Old Mutual) to find out why they stopped debiting from my account only to be told that they stopped debiting from my account because they where informed by one of the banks (Capitec) that i am changing banking details of which i did not change my banking details with them. As per my agreement with Old Mutual i feel they should have called me to verify if i have changed banking details or not because i did not sign or authorize anything to change my banking details with Old Mutual, i have lost the policy that i have been paying for over 2 years without my concern.