Pier 1 Imports — credit payment

I opened a new credit account July 11, 2019. I sent my payment in late because they did not send a bill until after the due date. They charged a late fee and interest which I paid - 10 days before it was due. They sat on the 'late fee' payment until it was past due and sent me a late fee charge on the late fee + interest. This is a scam! I now see that this has happened before.