This is not a simple PFL.
@Naturgrl is correct and this is serious. When you posted you got a PFL for itinerary you made it sound like a routine PFL but this is not. Visa officer thinks you have lied and provided fraudulent documents.
Did you use an agent? Pardon my words but this is one of the most idiotic ways of getting banned for a fraud. an itinerary is not really needed for a visitor visa and there is no reason to upload a fraud document.
My guess is you uploaded an itinerary and you didn't really book tickets or you booked and cancelled it next day. Officer may have searched it using the PNR and your last name and didn't find an active ticket.
If you indeed booked a ticket then you need to hire a lawyer. Else there is no way you can contest this ban, You lied and get caught and worst thing is you lied about something which would not have mattered if you didn't upload the document.