This site states this specific wording directly under its guarantee section: if you're not satisfied with your experience, simply contact us through our support channel and our team will make it right.
Rather than a generic "contact us for a refund" line, this site frames its guarantee around a support-channel conversation and a stated commitment to make it right — worth understanding this as the described process before you order.
Contact the support channel referenced in this section within the 60-day window from your original purchase date, and reference this stated guarantee wording directly in your message.