Homeloan not keeping to agreements.

I signed an agreement that my bond gets deducted on the 27th. Now on regular intervals im getting sms's to inform me that my installment will go off earlier! PLEASE NOTE... I AM GETTING PAID ON THE 27TH. should you continue with this is will remove my bond to SA Homeloans. The opt out doesn't work as I still had to phone twice to ensure the debit order didn't go off to early in December