Beware of the Contractual small print

My wife got an SMS informing her that the Tracker device had not been working for 24 days. She phoned them to find out what the problem was. Call Centre said they will send a technician to check for a call out fee of R550 . The fitment centre phoned to make an appointment. I then called the Fitment Centre for clarity to be informed that they would fit a new unit. I was informed that I must cancel the old contract ( paying R 337-55 per month) for a new contract at R 199 per month. Here's the small print - in terms of the old contract I must pay a 1 month cancellation fee R 337.55 for a unit that does not work and then take out a new one. It didn't happen - I cancelled the contract and will pay the ******* and went to Car Track - great service - I highly recommend them