worst case scenario if someone is rude to you they will probably just hang up. it can feel like crap but you can always call back and if you get the same person, you can tell them they were being rude, and if you get a different person you get to try again. ultimately you also have the power to hang up if it gets too overwhelming or if they start being intentionally awful. keep at it, being afraid of the phone has kept me from getting what i needed way too many times. it’s not worth letting the fear and anxiety take over. for reference i have a gnarly stutter and have absolutely ended phone calls with a sobbing session, but phones did eventually get easier with practice.