Quoted High on a car insurance

Since 2013 April I have been with MiWay until now , I don’t remember skipping a month not paying. Now I bought new A4 Audi and Miway agent called to quote me on this new car. Quote came back with a premium of R5000 and 5000 excess while other Insurances companies with full comprehensive cover quoted more less, I told the agent who was helping with a quote to give a valid reason why the quote is so high, he promised to ask his boss to see what they can do to bring it down, he never came back to me until now.. Why my quote is so high while other who just joined and drives same car they pay less ? because since i joined i was never been in any accident . is this how you service a good and loyal customer ?