I'm going to hang up on someone with an accent I couldn't understand.
Their accent was that strong to be unintelligible?
I couldn't understand what she was saying in what language.
I know it can be difficult to understand people with an accent at times, but that's not a reason to hang up on them. You should do your best to bridge the communication gap so you can accomplish the goal you have for talking to them. It's also insulting to them and will make them feel bad if you hang up on them because of their accent.
No I'm going to do it, people with accents just ruin a conversation and make it too hard to understand them.
They took the time and effort to try to learn English, can you imagine how difficult it would be if you learned their language? Try to understand them and ask them to speak slower, after awhile you may get accustomed to it.