@Giofrusti57
If you do not have the code of the device, then it is not a Swisscom issue, then you need to do a factory reset, then you can set the code newly:
https://androidbiits.com/hard-reset-nokia-1-4-ta-1323-ta-1329-ta-1322-easily/
there are also a plenty of youtube films in the internet, which you can with google for example
If you have a Sim-lock on the device please take a look here:
https://www.swisscom.ch/en/residential/help/mobile/sim-lock.html
If you forgot your pin for the SIm Card, please take a look here:
https://www.swisscom.ch/en/residential/help/mobile/pin-und-puk-karte-entsperren.html