Wake up Standard bank!

Standard bank homeloan short deducted on our debit order, they contacted us last frinday, I made an arrangement for them to deduct the outstanding balance of R430 from our bank account, they said they would deduct it last Saturday. I is now Friday again and the money has still not been deducted and we are getting constant emails from them saying we didn't adhere to our agreement but them money is still in there account to be deducted so it is there fault not ours and I recorded all my conversations with them.