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Low in call bluetooth volume

Star I
I am using max pro m1
android 9
build - PKQ 1. WW-Phone-16.2017.2009.087-20200826
My bluetooth headphone problem.
I am using boat rockerz 235 v2.

It runs fine and loud with all audio except during calls
media volumes are good, video playback, mp3 players, online & offline music apps, you tube, whatsapp calls all are ok, get loud output at max volume,
when i receive or make call through service provider ( normal incoming and out going) volume suddenly is almost half even all sliders in my phone are @ maximum and bluetooth device volume is also maximum. unable hear other person properly if outside.
tried different bluetooth headphones l, tried chaning some settings in developer options like disabling absolute volume but nothing changed.
i did search a lot of places, no luck.
Please help me solving this issue

Zen Master III
Hi, kindly factory reset your phone after taking a full backup:
Last option would be to visit the service center to have a
check. Locate here:

Star III
You don't know anything about Asus Zen Max Pro M2.

I already reported this bug.
You didn't agree because Asus developer team could not fix the bugs.

Indian service centre guys accepted that. You are guys not doing anything to solve the issue.

Very pathetic.