Never ending call

when im on a phone call with someone,even tho the other side hangs up the call on my phone never ends and it keeps on going even tho there is no one on the other side…it goes like that until I hang up..

also when I’m calling people and if they hang up because they can’t talk at the moment I don’t notice that because my phone shows me they picked up their phone…yet no one on the other side cause they never picked up their phone in the first place