Later comer here, sorry for slowpoke. I can't help be to invite TS to clarify.

1. My question to TS is... had it been a physical assault as you described as punched took place, I am curious why you didn't get the police to arrest him on the spot backed by cctv playback by police request? The police surely saw the bruises you posted online and act on it.

2. It's your due diligence to ensure what you bought is what you need, by inspecting what he measure is correct. If price not fair you should don't pay and walk away and not quarrel about price.

3. Rim cap as a forumer pointed out, takes 30s to fix it, why didn't u do it yourself? Besides, in whatsapp you shared, seller already replied that simply "ambil keluar dan letak". But you needed installation, it's fair for workshop change a standard fee of min RM10 or RM20 per service.

4. One cannot fault another person simply that he decided to reserve his right to reveal any info for your advantage. You would not do the same either.

5. Your refusal to accept an exchange but insisted refund has sparked the argument, seller already stated it's his mistake and want to do an exchange, buying from him is a form of acceptance (unless you can prove no display no refund policy), why didn't you just get the right wheel cover exchanged and go home to sleep? instead you want to waste everyone time further by writing this.

6. I am not a fan of those who like to drag everyone in (including police) for his RM40 mistake. Do you think police duty is to be taken for granted or to take care of your feelings?

7. You said your mishaps was injury and RM40 and some hassle so focus on your injury, but why did you attack on invoice, NCCC and KPDNKK? This is your personal revenge, don't let it get to your head kiddo.

8. You said you are green (newbie) about cars, i say the same greenery could be extended to your lack of understanding on how the world runs, i.e. it doesn't revolve around you.

Vengeance will eat you alive, so let karma do it's work where it fits.