1. First, contact the yellow pages customer service of travel group purchase and ask about the return regulations, including the return time, refund amount and other related information.

2. Secondly, negotiate the return: Next, negotiate the return with the sales staff of the tour group, explain the reasons for requesting the return, and provide the corresponding supporting materials. If the salesperson agrees to return the goods, he should confirm the return address and other information with him.

3. Finally, restore the original packaging of the mattress, and send the mattress and packing box together with relevant documents (such as order number and product picture) to the return address. Wait for the sales staff of the tour group to collect it, and then handle the refund and other matters in the agreed way after confirming the problem is correct.