Alarm Capital Alliance - After doing business with them for 6 years, my alarm system stop working. I called them numerous times to come fix it, but they did not fix it. I cancellecd my contract with them via telephone and via register mail. I then got ATD security system in Dec 2009. Now I have a collection agency charging me for a contract that they say I have until 7/14/2012 with ACA. They are charging me $805.00. If I don't pay they said they will ruin my credit.