Bad service

The service is very bad. It is 3 months that the one camera is faulty. After reporting it they send a technician out and he spend 5mins and left. I call him to ask what is going on and he said he has to pick up a part and will come back. Nothing happened. I report again. We made another arrangement and they didn't pitch up. Now I am waiting for the phone call to arrange again for the 3rd time. But they want their payment in full at the end if the month. If I want to end the services then I will have to pay a cancellation fee. Really not happy.