@vivasantiago are you saying you have a duplicate listing? If so, you should be able to just click the box on the left side of one of them and end item.
Happy 2018! May this upcoming year be a prosperous one!
Go to the bottom of the page click on site map. Next page top click on SELL. Next page middle column click End my listing and enter item number there.... You have around a dozen duplicate listings according to this site..... http://www.isdntek.com/ebaytools/DuplicateListings.htm
