iPhone 11 network data connecting issue

iPhone 11 poor E network .

Bad 4G network. Reset network setting / APN / change eSIM / Flight mode off and on . An hour later back to E again .

Maxis service provider customer services agent spoke iPhone 11 system is not compatible with maxis telco hence bad network not related their services .Apple care center information to me , they received a lot of complaints from customers regarding the same issues with maxis service providers .Only iPhone 11 specific model such have this issues .any helper ?