ADT security client service up in smoke !

I reported a broken device to ADT last year September 2019. Because cables were ****** and a piece of the devise entry blew , ADT quoted me R2k to fix it??? So since last year SEP i have been sitting with a broken devise and ADT month on Month keeps on charging me interest , when on numerous occasions i have asked for this service to be cancelled immediately. Eleven months later ADT is still charging me interest on a broken device - and now they expecting me to pay them. I am mortified at the kind of service !!! im going to social media with this and will be exposing them - DO NOT EVER USE ADT Security - their service is really bad.