Je me permets de vous écrire car chaque mois, je suis prélevé de CHF 17.30 alors que je n’ai pas d’abonnement en cours. Je ne comprends donc pas.

Hi there 

Hope you are doing well and thanks for reaching out. We are sorry for the trouble you are experiencing.

I have checked your Adobe account and unable to track any active/paid plan. Please check the steps shared in the help page https://helpx.adobe.com/manage-account/kb/unknown-charge-on-bill.html and see if that works. 

~Amal