Hello,
Peut-être se renseigner par téléphone ou mail ici ?
https://poliziamunicipale.comune.fi.it/tourist_help.html
Management of Reports for Administrative Violations Against People Residing Abroad
The service of international notification of administrative violations issued by the Municipal Police of Florence to citizens/companies residing abroad as well as the processing of data received from car rental companies and all activities related to the correct execution of the sanctioning proceeding are entrusted from 13 june 2019 to Multiservizi Srl/Safety21 Spa.
Multiservizi/Safety21 spa will respond to requests for information, in relation to notifications of administrative violations sent abroad, via e-mail, firenze@myfines.it, or by phone 0039 0763 616514 from Monday to Friday from 8.30 to 17.30. There will also be an office located in Florence via Ponte alle Mosse 98 / C red from Mon to Fri 8.30am to 1.00pm and 2.00pm to 5.30pm.
However, for the violations prior to June 13, 2019, the company Nivi Credit S.r.l. remains active, for the management of notification of administrative violations previously assigned and still collected through credit recovery.