Yes I have done. And mistakenly gave postive feedback instead of neg as I was using my mobile phone app for the first time. Thanks for your help.

Sellers cant leave a negative feedback. The option is not there for them.

 I think second chance bidders are given 48hrs to respond to offer.

After that, you should be able to relist.

Contact ebay and ask them to remove your green negative feedback due to phone app mistake. It will be better coming from you rather than coming from the bidder.