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I’m from Connecticut and once had a serious problem with a person my company insured from North Carolina. He was talking to me about what caused his accident and I kept hearing “tar” instead of “tire.” We were equally qualified as native speakers.
If you’re concerned, you can listen to more Indian English, because familiarity should ease any understanding difficulties in the future.
Sometimes it’s a second (or fifth) language for Indian people, but it’s also a dialect which is just as valid as your dialect and it’s got the second most English speakers in the world. The accent may just be an accent, you definitely shouldn’t assume that it’s a sign someone will have incorrect English. It sounds like you’re not in practice, but that’s definitely how I read your comments