Your mistake was going back to Proton for the minor paintwork job. They probably sent it out to a crony subcontractor who did a shitty job.

Keep complaining and keep escalating to higher positions (Proton HQ) until they fix the problems. Then ONLY send back to 4S for the warranty service. Never go back for other issues.

Unfortunately, Proton is not Perodua. Proton service is kinda bad outside the very basic maintenance work. Reason being that they make NO money on fixing your problems. Car manufacturers are more interested in performing warranty maintenance work because at least they can charge for the parts and workmanship.

Secondly, many of the technicians have no expertise on all these latest batch of Geely cars.

That's why extended warranty is a joke. You only stick with their service to have your engine, transmission and structure covered because those are the expensive ones. After warranty over, look for a decent workshop outside for maintenance.