So bad even the sales people don't answer!

After numerous calls over a span of a week, I'm struggling to get through to sales / upgrades. I got through to accounts and after the second time they were able to assist. I now need to install for a new car and accounts can't help, they said they will try callings sales but no answer.

I am an existing customer with 3 cars connected and want to add a 4th. Considering the struggle to subscribe/add onto my account, I'm thinking whether they'd be able to assist if my car gets ****** or will I struggle to get hold of someone then too!

Thinking I should just cancel all contracts (which are out of the initial 24months & move over to Netstar. But at this rate, I'll probably struggle to get hold of someone in cancellations too...