Worst service ever.

I have phoned them three times in month to get a technician to come out to review our system with a view to upgrade, but had no response at all. I had to disconnect the system for over two weeks due to a problem with the battery, and they did not even register that there was a problem. When we had an alarm activation, the response report was that there was people on the property, but they could give no name or gender. Then when I cancelled our contract giving over 6 weeks notice, in writing and delivered by hand with their radio, they continued to debit the account and when investigating this after I complained, they found no record of the cancellation. When my security and safety is at stake, how can I ever trust a company that has no idea of what is going on?