Wrong debit date

i am very annoyed by your services i made arrangement with your collections agent for my account to be debited on the 23rd of December to my surprise my account was debited on the 15th of which i did not get paid the funds were meant for my grandmother's medical fees now i cant pay my grandmother's thanks to African bank you never seem to amuse me when it comes to debiting on wrong dates..I need those funds paid back to my account TODAY COB as i need to pay my grandmother's medical fee before close of business