It’s really hard to lose any interview just because of stuttering. I’ve been in that situation before too but keep trying you will definitely get a better job!! There are ways to control stuttering and it has helped me a lot and now I’m working as an internal auditor at Ernst and Young (The big 4) wherein I have to make phone calls every single day. I’m happy to do it :) the things that helped me the most are mind training with positive affirmations and voice modulation!!