The £5 calendar was branded a "letdown" by angry Twitter users who'd hoped to see their favourite Teaser chocolate appear much sooner.
The Christmas calendar hasn't been a hit with fans, as there was online outrage at a mini Bounty being behind the calendar's first window.
As the festive countdown continued, some fans became more and more grumpy at the lack of their favourite chocolates: a Malteser Teaser, a Galaxy or Galaxy Caramel.
A Maltesers chocolate finally appeared behind window 12 – but that was too long to wait for some chocaholics.
Jodie Everitt wrote on Twitter: "FUMING I had to wait till day 12 before receiving a Malteser in my celebrations advent calendar."