Ridiculous Excess Fee charges

I am constantly charged for excessive fee, this month I was invoiced R 1725 when disputing this I get no feedback from anyone. In addition when the alarm is activated there are times I never get a call from control centre and other times that control centre will call multiples times even after advising that they should put a note on their system. My father was with National when it was still named Chubb for 17 years, I took over his account so in total about 20 years however the service received once they renamed to National is abysmal. I am constantly being charged ridiculous amounts for excessive call outs but the last invoice is too much.