Funeral policy

I went on pension in May 2023 of which i did notify old mutual about that they will need to debit on my grant pension money as from June 2024. Of which previously the premium was deducting from the pay slip.

I missed a payments in June and I was advised to pay that amount at the post office of which it was R288,75. After paying that amount old mutual decided to debit my account twice claiming they never received the one i paid at the post office. They have been taking R318 from my account as from July 2023 double debiting me for an outstanding balance that I only missed one month off.

They continued to debit my account with R318 even when the outstanding amount was covered. I went to the Mtubatuba branch to consult about it and they assured me that it will be sorted it is a mistake on their side but i had to go back twice for the same complaint and on both occasions I was assured that it has been sorted.

They finally refunded in May and I thought it was over. They are back at it again, went to consult again on the 19/09/2024 and i was assured again that it has been resolved which is a lie they debited my account again and again. What do I have to do for them to stop?