Send the buyer a polite message explaining the error. Ask them when they receive the item, to open a case of item not as described immediately.
When they do this, accept the case within 3 days, and issue through the case details a tracked return postage label. On receipt of your item refund the buyer through the case.
Stick with the instructions and timeline above, and your seller performance will not be affected.
@amrobe-8589
