South West Credit System caleed my home telling me to shut up Internet

I got a phone call from south west credit system because i had att cell phone service.and i had moved to another state and then att id not have coverage .so i called to have the phones turned off.2 months later att shut the phones off.then i get a bill in the mail from att.for 180 dollars.i call them to say im not paying it.so i get a phone call from this south west credit system.the guy that called me is yelling at me telling me to shut up and listen to him.not when you call my home.this company is a joke and im thinking about sueing them for calling me every day all day

Lee
attica, Ohio
U.S.A.