ADT - ********ly charging a customer R1700 to be released from a contract that was never signed

I have been with ADT for more than 10 years. However in the last 2 years the service was abysmal, Id call for them to drive by during load shedding and this never happened, took 20mins to get to me after an emergency and I didnt see the ADT car driving in my area. I have since cancelled ADT and gone with Beyers security . Imagine my surprise that not only did I have to endure substandard performance I was also informed I have to pay R1700 before I can leave as I apparently signed a 36 month contract. I say apparently as this is a lie and ********. They cannot find or show me the original signed contract because I never signed one. The management made a decision that it did not matter that I did not sign an original contract, I am to pay anyway. This is ******** in terms of the companies act 71 of 2008. Only a signed contract can bring terms conditions into fruition. Im glad Im leaving but this matter of payment will not go away and I do intend to escalate to all online platforms as well as logging a complaint to the security Association of south africa. I will cancel all other ADT services for my and my extended family business. Im tired of big business conducting themselves in this ******** manner and forcing the customer to pick up the tab