Not helpful

I had a large salary deduction due to unpaid leave, my insurance unfortunately did not go of. while I am mindful that it is due to be paid in advance, I have been given a grace period till the 17th. However, funds will be in the account on the 20th, there are various scenarios now, where im covered till x date, and not covered. My confusion is, that if in fact I can provide proof of the deduction, sign a document requesting the debit order to be moved by 3 days, is there absolutely no way of resolving this issue