Unsolicid SMS's saying I owe when I dont

<p>NuDebt keeps harrasing me with threatening messages stating that I owe when i have provide proof numerous times that i do not owe. Even when i call they say my account is clear but they wont close my case. I don't understand what this means and would like my name and details removed from their system cause clearly i do not owe. Please stop harrasing me and sending me threatening message. STOP!</p>