Double debit premium

I have a life insurance policy woth FNB, I was in contact with FNB regarding this already , the policy is 2 months old the 1 debit order was fine at R564 then suddenly they debit double that lady month, without warning/informing me I then discovered this an informed last week, was told I would be refunded 48 working hours this was last week Thursday already it's now a week later an still nothing, If I do not get my money by end of business today, I will lodge a complaint with the bank ombudsman. Firstly I have agreed to that debit order, secondly I was not informed about that amount. Thirdly now the debit cannot be revised at the branch like they do for transaction that were ********** because that was a ********** debit without my consent.