Pathetic Old Mutual

I have had enough of old mutual and the lack of service provided to their clients!!!! For the past 4/5 months they have been debiting my account on a date we did NOT agree on. My debit order date has always been the 25th but of late they decide to deduct whenever they want which results in them not finding the required amount in my account,furthermore they have been transferring my premium amount into my account on the 25th then subsequently deducting the said amount at random... WHY?? I have called their contact center for over a week now and every single day I am placed on hold for over 30mins to the point that I have to end the call. Emails go unanswered. I need a resolution to this matter as soon as possible, I will be penning a letter to the Ombudsman for assistance in the coming days and I need to cancel and cut ALL ties with this ************ company.