Can't list without UPC codes

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All the items I list are custom made items and have no UPC codes.  They want me to update my listings.  I've tried and it won't let me put in DOES NOT APPLY.  I contacted eBay support somewhere in India and the woman walked me through how to change them.  After 45 minutes of putting my brand in and "Does not Apply" for the UPC as the woman recommended I got an error message that said I have to put in a valid UPC code.  My good till cancelled listings are already staring to end and it seems there is no way to relist them.  It appears that eBay is turning into Amazon.  How am I supposed to list my items?