If the item you ordered has not been delivered as scheduled, or the tracking information indicates the package may be lost, the best thing to do is contact the marketplace where you purchased the item.
You may request a free exchange or a refund, then reorder the item. In either case please just be sure to update your order number for the associated redemption using the link below.
The customer service contact information for all marketplaces that Rebaid supports is listed below:
Amazon Customer Service
Walmart Customer Service