Airdots distorted audio while calling I have a Xiaomi Redmi Note 6 pro and a pair of black Xiaomi AirDots but every time I call and play music together, the music is as distorted as the call itself like the music's coming from the caller.

How can I undistort the audio?
You can't.

Bluetooth has many profiles, ie. modes that have different capabilities. When you're just playing music, the phone is using A2DP profile which is optimized for unidirectional high-quality sound. When you're calling someone, the phone switches to HSP profile, which offers bidirectional sound - but allocating some of the bandwidth for microphone reduces bandwidth available for incoming audio, degrading quality. You can't have both because there's not enough bandwidth.