Business ProfileforIP Systems LLC

I received a letter from IP Systems LLC claiming I owe a balance with Chase *************** I explained to IP Systems LLC representative named ************************* that my credit information with ********** shows zero accounts in collection. **** told me that IP Systems LLC had the balance since 2017. I informed **** that I requested previous bank statement copies to go over my accounts I've paid off. **** told me I had until Monday April 1st to make the payment, or it gets worse. I asked **** to please be reasonable and allow the statements to arrive by ******************** are not available online because I have closed my checking account months ago (customers request). **** refused to provide his operator number. I asked for a manager to speak with and/or their operator number. **** refused. I contacted Sunbiz.org because IP Systems LLC is registered in the ****************. IP Systems LLC registered their company in 2020. How could IP Systems LLC have information from 2017 when they weren't even doing business in ******* until 2020? This caused alarm. I spoke with ******* ********** of *********** and ******** Services (1-800-HELP-FLA), as well as the Federal Trade Commision *************) to alert them. I called IP Systems LLC back. I asked **** how long he has been employed with that company he told me "don't worry about it". As I was re-confirming the date/year of the questionable debt, **** raised his voice and started yelling at me in an abusive unprofessional way. I requested to **** that he not yell. I also asked **** which family of card products does the debt belong to, transaction history, or an agreement. **** could not, and did not provide those details. I pulled a free annual credit report from all three reporting agencies and it also shows all of my accounts have been paid with zero balances and nothing in collections. I am filing a complaint against IP Systems LLC. I do not owe or claim any balance.