You can request a refund of released funds from the freelancer directly for up to 180 days after payment is released. However, you will only be able to get mediation assistance from Upwork for 30 days after payment is released by contacting Upwork Support.
Upwork mediation specialists serve as neutral agents, meaning we cannot guarantee or enforce refunds or delivered work.
Remember to only release funds after you have received the work and feel satisfied with it. Once payment is made, the work is considered approved so your payment is not refundable unless the freelancer provides a refund directly.