You can submit a query or application, or file a complaint to the Hellenic Telecommunications and Post Commission (EETT) in relation to electromagnetic interference:

• that obstructs wireless communications such as mobile telephony, television, radio, air traffic control, remote control, amateur radio stations and WiFi networks
• that causes problems in the operation of wired networks and electronic/electrical equipment such as wired phones, loudspeakers, video intercoms and modems/routers

You can attach up to 5 documents to better substantiate your complaint.