- Always ask for a receipt.
- Check it out in details.
- Refuse to pay the "coperto" voice and subtract yourself from the bill
- If pay cash give the exact amount (of course with NO tip!) and wave goodbye
(never leave cash on the table, hand it to waiter/cashier)
- Give a call to Finance Police at 117 (free of charge) and report the business
With those dudes being firm and resolute is the way to go.
"Il coperto non è dovuto" - "Coperto is not due"
That's it.