Momentum health, only when it suits them

I've been with Momentum health for about a year now (I've never had this problem with Bonitas), and have never missed a payment. In the beginning of the year I requested that my debit order go off on the 4th as my salary is only paid into my account from the 1-2nd of the month. Now I have changed to another contract house and my salary is now taking longer to show in my account (time difference between banks and so on), so I asked them to move it to the 6th of every month from next year just to make sure I am not in arrears. Momentum flatly refuses and basically stated that if the money is not in their account by the 1st of the month all benefits will be suspended. Pathetic customer service. They can suspend my benefits there are a million medical aids out there