No response from Agent after quotation and wrong information given

I called in to Oakhurst to request a quote on a car insurance. Simangele was the agent that assist me with a quote and gave me two options - the quote was better than what i'm currently paying but when the underwriter called to confirm all details and do the necessary I was then told about the smartbox/netstar which she said I was supposed to be informed about and was never told. so over and above my quote i now have ot pay R160 extra for this device i never asked for nor do i want. This is ridiculous. Prior to this i was an Oakhurst client and was never asked to install this device in my vehicle also my last account with netstar is part of my sequestration and should not affect my quote or premium now. I want this sorted out please.