Angry and de*****ed

I had installed their devices September 2019, December 2019 both the tracker and panic button were not working. I called so they can come and fix it as it was still within warranty. No one came. February they were still deducting but no one came to repair my devices, so I called to cancel the contract. Today date they call me several times a week demanding their payment and still have a nerve to add more installments onto an already cancelled contract. I’m angry and disappointed, I feel ****** and left without protection as I had taken the tracker to protect myself.