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How can I decide whether this product meets my needs?

Ask the seller about a missing detail instead of assuming it matches your expectations. Do not infer a capability solely from a photograph or a short title.

What should I do if I may have placed the same order twice?

Compare the product options and quantities shown in each record. If several people are arranging the purchase, check whether someone else submitted a separate order.

What should I verify before marking a support request as resolved?

Compare the outcome with the arrangement you actually accepted. Retain relevant evidence until you are satisfied the matter is settled.