There are enthusiast forums for Citroen vehicles where you are more likely to find specialist help. Here's a couple to get you going:
https://citroenc3owners.com/questions-about-a-citroen-c3-automatic-gearbox-f25/car-stuck-in-auto-mode-and-will-not-start-t574.html
https://frenchcarforum.co.uk/forum/viewtopic.php?t=60705
Hth
December 2022
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