The most correct structure is the last one: "if you don't happen to be satisfied". I would not use the first two. Alternatively, you can also say: "If you happen to be dissatisfied…".
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AnonymousThe most correct structure is the last one: "if you don't happen to be satisfied".I would not use the first two.Alternatively, you can also say: "If you happen to be dissatisfied…".Thank you for the advice