I booked an unit in a new launch project. Done processing my loan and finally get approval.

Now the thing is when i visit the sales gallery and ask about the upfront payment i have to pay when sign SPA, and they go through the prices with me again.

And now I found out that my agent gave me the wrong nett price on my booking form. As I am entitled in a 10+5% rebate, the agent calculated the nett price 15% deducted straight away from the SPA price, which it is supposed to be deduct 10% then deduct 5% again. And the different between the actual nett price and the wrong nett price is around 7-8k.

I kept all the booking form black and white  signed by me and the agent.

Any advices?

p/s: the agent service is horrible, and I am really not satisfied with his services.