5g issue

I ama using note 20 ultra thre is a strong network issue ,showing network candle 4 out of 1 some time zero also I am note able to use airtel 5g or jio 5g , one of my friends using vivo t1 worth rs (15000) approx. I inserted my airtel card in vivo mobile he can use airtel 5g also there is a network candle shows 4 out of 4..

I am leaterly shocked.

Samsung note 20 ultra money not worth it. 

Samsung not given any update about network last 4 month to fix these issues