debited on wrong date

I made an agreement with Assupol to deduct on the 20th of every month now for December they have decided to deduct on the 14th I don't understand why as I never said I wont be able to pay on the 20th of December now they have taken the money that I am supposed to survive on and go to work with until the 20th when my debit goes off. Please Assupol advise now how am I supposed to get to work. I send an email to your complaints department which does not help me because their turn around time is 48hr and i need my complaint to be sorted out today and my refund to be done. The agent i spoke to said they cant refund will get supervisor to call me I'm still waiting for a call from that supervisor .Please refund my money I need it you will deduct on the date we agreed on i need the money back in my account today or repay all my premiums and we end our business i will find another company to do business with