> could you please delete all rules regarding deleting of the data in the future from my profile?
Please do that by yourself. You can simply delete the schedules that you have creates. We do not change your settings, unless there is not other way.
> I clearly remember that i did not set any rules
If you did not grant anyone else access to your project in the meantime, there is nobody else who could have done that. Possibly, you clicked thw wrong buttons when you deleted your testing data before starting the survey?
> the data is very important for me
We should be able to restore the data after your data collection has been finished, however, that is not for free:
https://www.soscisurvey.de/help/doku.php/en:results:restoredata
How long will you continue to collect data?
By the way: Please check if your questionnaire is working properly. When opening the questionnaire URL you sent me, on a smartphone, you cannot see the dropdowns. Please make sure to select the "dynamic" display mode for these questions, if there may be respondents using smartphones.