Poor Call quality, good music quality

Hello everyone, i have a 20s dual pack, which works relatively fine...

I always had an issue regarding the phone call sound quality, i dont know why, but its like if the speakers had blown... in mid to higher volume setting, cant understand some words, the distortion is terrible. I don’t think its poor signal, because if i use external earphones, the sound quality is good. But the strange thing is, listening to music at max volume, the quality is great (for what the provided speakers can offer),  good bass, good treble...

does anyone have a clue what this could be?


Thanks in advance. :)



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