Dr. Pires, While it's true that a student might (under some conditions) be able to obtain a refund on their money, you cannot refund their time. If a student cared enough to leave detailed feedback, and you believe that they missed the mark, consider why that might be. For example, if a contextual example you gave lead the student to misunderstand the concept, consider how you might change that so future students don't make the same mistake or come to the wrong conclusions. I doubt very much the majority of negative feedback you're likely to encounter on uDemy is going to be from trolls with nothing better to do. They are paying customers, and should be treated as such. Try not to see this negative feedback as adversarial and instead, try and determine what (if any of it) can be used to improve your coursework.
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