Unpaid item despite me listing all "Buy it Now" as immediate payment. Will I lose my £1 max offer?

A buy has purchase an item from me and it's now more than 2 days later and after several payment reminders I have heard nothing.

All my items are listed as buy it now and requires immediate payment so I don't undersatnd how this is possible.

 

I have opened an unpaid item case but the item was listed with the "£1 max selling fee" offer which has now ended, if I relist my item in 4 days will I lose that?  It's not my fault that the buyer did not pais or that eBay for some reason allowed them to not pay immediately!

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It's not possible for a buyer not to pay when the listing is Buy It Now with 'immediate payment' activated.  Could it be that the listing was an auction listing with a Buy It Now option...? If not, then you simply forgot to tick 'immediate payment' during the listing process.

 

@grumpy_grumpy_git