Pathetic service Fidelity Adt

I have been battling with fidelity adt for the past 3 months i noticed that there was a delay in response when my alarm goes of so i told them about it, they then decided to send a technician to me to check the alarm after he left they invoice me and tell me im liable for that call out, and the alarm in question wasn't even 1 year old i then told them that i wont be paying that call out amount as no one advised me about it they argued that they told me about it over the phone, i told them to send me the recording where they told me that il be liable and i would do so they've failed and every month i receive a sms from the same person i phone and explain my problem to every month "Viola Mdluli" *** telling me im in arears with that call out amount im frustrated im even thinking of canceling this contract they're *********** they keep saying the calls are recorded but when u want the recording it can't be found.