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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https://www.ebay.co.uk/help/selling/listings/creating-managing-listings/immediate-payment-works?id=4...

 

According to this a BIN with immediate payment is not sold until the buyer completes the paypal payment.

 

Is the item in your sold items ? If so I think you need to check hat Immediate Payment is loaded as it would appear to be impossible  according to instructions.

 

I see that another answer confirms what I suspected. No Immediate Payment.