Agreed, extremely disappointed with their customer service! I had the exact same issue - should be quite straight forward to resolve but wasted more than 30 minutes with no result. And yes, the "Save 5% on every Coles on eBay order" is still being advertised all over eBay pages, incl. their own Buying with eBay Plus article, and the "PLUSFIVE" voucher is also still showing on their Coles Weekly Specials banner.