Apple problem issue ( Never Dropped, never water damage )

So sorry to read about your iPhone issue.

Since you chose not to take it to an Apple retail store for service, Apple was not liable for any inconvenience caused by the repair.

THIS is my recommendation:

Get expert service and support at the Genius Bar.

👉🏼 Call 1-800-MY-APPLE or get help here. 

mr fish wrote:

So sorry to read about your iPhone issue.

Since you chose not to take it to an Apple retail store for service, Apple was not liable for any inconvenience caused by the repair.

THIS is my recommendation:

Get expert service and support at the Genius Bar.

👉🏼 Call 1-800-MY-APPLE or get help here. 

Judging by the names of the businesses (and shopping centers where located) mentioned, the OP took the device to stores that are Apple Authorized Service Centers in Petaling Jaya, Malaysia (Kuala Lumpur area) where there are no Apple retail stores. Taking it to a Genius Bar in a country other than that of purchase will usually result in a response that it has to be serviced in the country where it was purchased.

At least Mac City claims to be an AASP.

https://maccity.com.my/index.php?route=information/information&information_id=4

Appointed as Apple Authorised Service Provider (ASP)

Mac City has been appointed as Apple Authorised Service Provider, the first and only ASP in the Selangor region. This has equipped the team with ability to provide one-to-one exchange for product which fail within the first 7-days of purchase. It also enable the team to perform all repair work faster and more reliable using genuine replacement parts. With such status and a team of experienced and certified technician, Mac City are able to further enhance it’s service and support to a much higher level.

So does Machines (yeah - that's the name of the company).

https://www.machines.com.my/pages/about-us

Machines (745167-M) was established in 2006 with the aim of being the one stop Apple reseller in Malaysia, and is now one of the largest Apple Premium Reseller (APR) in Malaysia with 38 stores nationwide, and growing. Machines also expanded into the service industry and obtained an Apple Authorized Service Provider (ASP) license in 2007.

I'm pretty sure that the warranty is only one year in Malaysia. Anything that happens out of that time is out of warranty. That's just the way most warranties work.