I cancelled my account with Chubb security 3 years ago but they say I owe them

<p>I cancelled my account in 2014 when I sold my house. They took my money for 3 months after I've cancelled the contract. I ask them to give me proof on cancellation, they did, but still I am receiving calls saying I owe them.</p> <p> </p> <p>People should be careful of this security company.</p> <p> </p> <p>I've sent them proof of cancellation to more then 4 different people but still they won't update their information. They even collected the radio from that house.</p> <p> </p> <p>I really dont know what to do now with this company.</p>