Well first off cell calls are notoriously difficult to listen at times, not sure if there is anything to do about that other telling the caller their call is garbled and try again later. You may want to tell your family members to text you instead. Am not hearing impaired yet {fingers crossed} but I much prefer people text me, that way I don't have to drop everything to pick up their calls which 99% of time is not urgent.
Now, have your tried using the speakers? again that would be my preference.