iphone x compass is not accurate ios 11.4

HI, My iphone X compass is not accurate, I try many things,

factor reset, reset location services,try to disable and enable compass settings from Privacy - System Services, I tried to call Apple support for a help, it was funny as experience i get in my life,

1 hour just losing time and it's called "Premium Brand" and Premium Support, they do not know what they are talking about or just avoiding answers because 1000$ iPhone 10 is a defective model, Very disappointing, that company Founded 42 years ago present cannot manage stability of his product, shame Apple. Steve Jobs would not approved that. they no longer produce a Device, they began to produce "Gadget".

nobody recommended to buy Apple product

regards.