There may be other places in kwun tong or san po kong area that are cheaper, but 5K-7K is not unreasonable, pending quality of work. You don't really want to go too low end. bad white paint may yellow quickly. Also, try asking the sales guy who gave you a demo when you bought your car. He may know some places. Alot of these repair places are online, just whatsapp them for a quote. Best to also ask if they worked on a Tesla, just to be on the safe side. Though a bit late, M3 does not have a good turning radius, be very mindful when u take corners. Watch the tire rims when you park. I fixed mine twice already (that is often DIY)