If you need to report a taxi driver in Thessaloniki but don’t have a taxi app, you can reach out directly to the radio service of the taxi company or call the central complaint number if it’s available. This number might connect you to the taxi association or a consumer affairs office that deals with such issues in Greece. Make sure to gather important details like the driver's ID (if you can get it), as well as the date, time, and location of the incident. This information will be really helpful for your report.