Is this a red flag?

Jul 2021
Haven't heard back by two people I don't know, other than for business dealings, about a refund. Does this happen? I never do this, I always get back to people, unless it's someone I don't know. Is the concept of professionalism different where you are? I am just worried that when it comes to my salary I will get the same exact behaviour, where I don't get paid and I don't hear back, as it happens in certain parts of the world. So I am always skeptical and someone should respond within the 24 hours.
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