It really sucks and its really a lame reason for you or any other person to be replaced for honestly:/ I get it its hard and it will always be hard cause people are just shits and sadly there's nothing we can do about it. Try finding a job where the talk is minimal its honestly the best option(I work at the job where communication isn't even needed) . The reality is that even if you can't accept now your stutter you will later in life cause you can't ever "defeat" it(Idk any other word for it so i used defeat) and you will live with it for the rest of your life. You can try breathing techniques(breathing from stomach/diaphragm) it sure helps cause it eases your neck and your support is coming from the stomach and not neck so there will be less strain and more air which will allow you to speak better! And try "Šum"(idk how's that called in eng) so basically if you struggle with H(or any other letter) when the word you want to say starts with H try to breathe out that H and rest of the word prounance normal (ex:House need to sound like*breath in* *breath out and say "H(long H)ouse/Hーouse/Hhouse, so when you want to breathe out you need to say the H sound) I really hope this helps I'm also sorry for the long message/reply also sorry it i made some grammar mistakes English isn't my first 🙏