Asus 6Z very low call volume in crowded places

I'm from India with latest update installed. I'm not complaining about voice call quality when I'm in quiet places like home or office. But in outdoor conditions / public places I can't hear a single word from the call. I have tried all volume levels and held phone at different angles but that didn't help much.
Looks like it's design / hardware flaw and won't be able to fix it by software update. This is a serious issue and Asus should pull back all the 6Z phones to fix it. Intoducing flip camera is great but if makes earpiece unhearable then that's not acceptable.
Looks like it's design / hardware flaw and won't be able to fix it by software update. This is a serious issue and Asus should pull back all the 6Z phones to fix it. Intoducing flip camera is great but if makes earpiece unhearable then that's not acceptable.
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Comments
https://zentalk.asus.com/en/discussion/7175/low-in-call-volume-on-zenfone-6-one-tip-to-easily-solve-this-problem#latest
The receiver might be a little higher than what you're used to, it's definitely higher than my daily driver.
BTW, I am from India.