cancel that debit order request

I received the following SMS: DEBIT ORDER: MTN acc *** due 30/12/15 will be tracked from 11th, pls provide. Call MBD INC. ***. I want you to cancel this debit order request. I am not authorizing it. As the SMS states, debit order is due on the 30th of December and not the 11th. The money currently reserved on the account is for the payment of my car insurance, and if you take any of the funds available that means the debit order for the car insurance may reject because you are greedy and that would mean I have no cover on my insurance. Please get this thing cancelled and debit order request kept on the due date which is the 30th of December. Please refrain from making my life difficult. Please cancel that request...