Continuation of debit for six years after mortgage

After finding out from the Hollard Direct walk-in branch in Cape Town that i have been debited for a house life cover for six years after i have finished paying for my house mortgage , i immediately instructed the consultant to stop the insurance and went to the bank and stop the debit and get a bank letter confirming that the house was paid off in July 2009. I then requested Hollard to pay me back my money with interest as i did not know of the insurance and did not have any contract documents. I was then told that it was an OOBA account and OOBA say their system can only pay up to 2012 (3 years only). 50% paid.I never accepted that and requested to speak to the manager who made the decision. For the past two month i have been going to the branch and speaking to consultants with no manager willing to speak to me and assist. Rachel Mostert in complains promised to sort the matter and call me for the past two month. i am sick and tired and i want my money in full with interest. please help. I have never head of the company Ooba and there was no way that i can let them know about the mortgage pay off when i did not even know that i had an insurance with them.