Sanlam Debit Order Instruction

I am feeling very helpless. I changed my banking details and I called Sanlam to update them for my debit order. I picked up that they didnt debit my account and so I did another enquiry. Still they didnt. I have been updating my banking details with them almost every month and still they are not taking the money. I was asked to email a reinstatement form which I did but also didnt help. Now I got an sms saying my policy has lapsed and I need to pay R1072 to update it and reinstate it.