Refusal to change Debit date and also causing Bank Charges.

I have been asking Old Mutual for change of debit date since from Last year because our salary dates were changed from 25th of every month to month end and since from last year Old Mutual has been debiting on the 25th of every month which causes me to have bank charges of unavailable funds. I tried calling in and could not get any help, i then went to Old Mutual Jubilee Mall and was shown on the screen that my debit date was changed to the 30th of every month but come the 25th/26th they debit. I have 4 policies with Old Mutual and my bank charges me about R110 for every Policy and this happens every month. I received an sms from Old Mutual apologising for the mistake they have been doing all those months but again a debit was done on the 25th. I am angry and not happy with Old Mutual.

I would like Old Mutual to change my debit date to the last day of the month and would also like to be reimbursed for all the charges since from last year.