lost my warrenty on my alarm system due to adt fitting antena and radio and not telling me about warrenty

<p>On the 13 December 2016 adt finally came to install my radio and antena. I told the technician that my alarm system is not working properly. He went forth and installed the system. Fact is if the alarm system is not working properly then adt will not be alerted and I will be liable for unecessary charges. I called the installer of the alarm system and he said once adt touch my alarm I loose my garrentee and adt tells me I'm liable for call out fee and all. I'm very unhappy would like to cancel this adt system and find a better security business . And my adt sign is not up yet since sign up last month. </p>