These are the timelines when you open a case for item not as described.

After opening this case,  the seller has 3 days to either send you a refund or a postage label for its return.  If neither happens,  on day 4,  you escalate the case and eBay step in and force the refund.

If you receive a return tracked postage label,  ( be aware some sellers may not want their item back,  in which case they Must refund within 3 days),    you post the item back,  and when tracking shows delivery the seller has 48 hours to refund you.  Again,  if they don't , you escalate the case eBay forces the refund.

@zzr.king