Most Americans would experiences the same. My (ours) problem(s) in oral communication with Dell Technical Support, whom they speak with very strong Indian accent, it is very hard to understand. I was wondering, what should I need to improve to communicate with them?

well firstly pronunciation is most critical for me , and currently i am a little bit confused about American English and British English for some of the words to pronounce . Secondly is that the slangs and idioms !! i can't understand when they are speaking that .it's totally confusing me .lol Last but not least , accent is crucial to me as well .

practise! i think that talking with english speakers should be good for improving my oral english ,but i have no chance to talk with others in english

i can understand the foreigners' english when they speak properly,such as those standard sentences using correct grammar.but when they talk to me by using idioms and slang and so on,then sometimes i cant get their meaning.so i think idioms and slang are my problem.

lack of practice