I fulfilled my contract with XXXX and all my bills were paid and current when XXXX ported my number, over a year ago, to XXXX XXXX XXXX. XXXX always billed me XXXX month in advance and they personally ported number my number over to XXXX XXXX XXXX and said good-bye. It was at the end of billing cycle and they always billed XXXX month in advance. My account was in good standing and paid in full during that billing cycle. Approximately, 3 months later, they called me claiming I owed them {$100.00}. I told them about this and they claimed they would clear it up. Of course, that did n't happen and they called me several months later saying i owed this money to XXXX. I told them this was not the case so they threatened me to report to credit agency and they did. They continue calling on many different numbers. I have blocked so many of there calls that XXXX wo n't let me block anymore numbers. They call the house and then my cell phone at all hours of the day and night and on all kinds of numbers across the country with many different agents. They are rude and XXXX agent literally yells at me. Please end this and make them remove this from my credit. I was a great customer of XXXX for over 5 years and this is most distressing. I will never do business with them again nor will I not pay them money when I do not owe them any money and if you do n't believe me, just XXXX the Internet and you will find hundreds of other folks with this exact same problem with XXXX. Ps. They never mailed me any written documentation and they all have the wrong address. Please help me.