Capital One Credit Card Complaint

Capital One Credit card department,

Billing disputes Florida

I HAVE A CREDIT CARD WITH CAPITAL ONE. THE MONTHLY PAYMENT IS DUE ON THE - OF THE MONTH. ATTACHED IS A COPY OF THIS MONTH 'S BILL. I PAID MY BILL LAST NITE - - AT -. CAPITAL ONE HAS INDICATED THAT MY PAYMENT WAS LATE AND THAT I WILL BE CHARGED $36.00 AS A LATE PAYMENT FEE. IF MY PAYMENT IS DUE ON THE - AND I PAID ON THE -, WHY AM I BEING CHARGED A LATE FEE. WHEN I CONTATED CAPITAL ONE, THEY SAID IT WAS BECAUSE MY PAYMENT WAS NOT SENT BEFORE -. NOWHERE ON THE STATEMENT DOES IT SAY ANYHING ABOUT THAT. PLEASE HELP.