Funeral Cover Contribution deducted in error

Good Day, I have recently had a bad experience with Budget Value Add services team. I have had a funeral cover with Budget for over 20 years, and I had added my parents under my policy. My mother passes away in December 2016 and I made a claim for her from Budget, they paid me. But what Budget failed to do was to remove her individual contribution from the policy. I recently discovered a month ago that there has been a deduction for her since then, this is close to 7 years. I lodged a complaint with Budget and they promised to refund me her contribution for the period since she passed on. To my surprise Bidget only paid me contribution worth of 3 years. I have even trying to follow up without any proper response from them. They advise that this is their policy. I feel this is unfair for me as a client to be ****** by Budget, they have taken contribution in error while they have paid out for the cover and now they are telling me stories. This is a ******* to the clients, who did this contribution that was not reimbursed to me cover? I would like an answer from Budget about this matter. My policy no is ***