Debit early without consent

I have had my policy for years with the group scheme from Old Mutual. And my annuity payment gets debited every month 27 or the 28. But last month they have decided to debit it on the 24th . I only get paid the 26 so hence my debit order is the 27 or 28. I called last month when it happened and the did nothing about it. This month again I get a sms a day before the plan on debited my account, which was yesterday. I phoned and after the first person say I am in the wrong department, the second person hanging up on me and the third person finally promise to change the date. But what do you know they debit my account today, When I ONLY GET PAID 26TH EVERY MONTH. I AM SO FURIOUS THAT I AM GOING TO MOVE MY BUSINESS SOMEWHERE ELSE IF THEY DO NOT SORT THIS OUT

You can even email Old Mutual, they take 2 weeks to even respond. Its really disgusting that you years, and I mean years with them and they start pulling this nonsense!