Shein

Do you have tracking or a receipt for the return?

Check your email for a tracking number for the return. . If shein does it well, then they should have had a label you could print off, then affix to the package.... Then tape that onto it and seal or reseal, then send it on its merry way . ( This is how Amazon does returns)

https://m.shein.com/us/user/support Shein's customer service can be reached through live chat on their app or website, or by email. If Evri handled the return, check with them to see if the tracking shows any recent updates, as this could help to find out if they’ve lost the package.

How are they taking money? Did you use something like Klarna to pay? As if so, you can pause the payments on there and register a return xx

How are you still making payments on it? Through Afterpay?