Daikin Air Conditioners Inverter Ac Sound — Inverter ac

The ac started making lots of aur noise we called technical team, that said it requires cleaning. After less than 4 weeks air sound resurfaced. The technical team said that this is a common problem in diakin inverter acs and the coil needs to be changed. I am skeptical to deal with technical team that bad moths the company. However our experience with diakin is getting impacted.