I’m also exeriencing very low volume on Whatzapp/Telegram calls:
Call is kind of ok - a bit low and often a metallic sound
Call with speakers is very low
Videocall are also very low.
Call with normal phone functionality is better but often people complain the voice is metallic, distance or not understandable.
With speakers is also often low.
I just want to chime in the thread. I also don’t have enough consistent data to contact the support but I will keep an eye and try to define better when this is happening.