Fifth Third Bank Violates Federal Laws Internet

First we got a call telling us they were reporting us to the credit bureau for not paying a bill.  (It was 3 days late).  I called them back after checking my bills and found I did not have a statement to pay.  They agreed to waive the late payment fees because they admitted they had not gotten all the bills out "due to the change over" (whatever that was).  I told them I had gone on the Mastercard website and there were no statements there.  Also, I could not change any information about me except my email address so if I moved, I could not update my account. 

 I asked that they fax me a statement so I could write a check that day.  They said it would take 5 days to fax me a statement.  I said forget it because snail mail would get here sooner...but they promptly faxed me a statement and I wrote the check. 

US Post office has reduced the pick up times so they did not get my check in the mail till the next day.  So 3 days later, the collection calls from Fifth Third Bank started.  There have been 6 calls today..4 this evening.  I think that violates the Federal Law (Fair Credit Reporting Act).  I told them the check was sent and the fact it was late was THEIR fault for not sending a statement.  I have stopped answering the phone.