ADT Ripoff Disconnect Fees Salt Lake City, Utah

I had an account with ADT Security for the last three years.  I paid them religiously approximately $50 per month ($1800).  When financial hardship caused me to close my store, I called ADT to cancel my contract, they told me that my disconnect fee is $900.00.  I told them that $900 is ridiculous and asked how other people react to the disconnect fee.  She said that they all react about like I did and that it's in the contract. Don't sign anything with ADT.  I have paid them a TON of money and as I'm trying to pick up the pieces from a failed business, they are trying to extort $900 from me.  BAD PR move ADT.