Terrible service.

I have been sending enquiries on the website requesting for my contact to be cancelled. no one has got back to me. today I receive a call that my debit order has bounced I explained to the agent that I have send an enquiry requesting the contract to be cancelled. she then told me that I have to pay R2000 cancellation free she was very rude said she doesn't care how I pay. I was never advise about the cancellation fee when I took the tracker. instead of them cancelling my contact they want me to pay R2000. what makes me mad is the fact that i was never informed that if i cancelled i will be charged that amount. my partner lost his job and we are going to sell the car, hence i am cancelling the contact.