We are Company operating a taxi circuit in Bishops Stortford, we are 100% Hackney Carriage and are regulated by East Herts Council. We accepted a booking for Friday night. The journey started and ended outside of our licensing area. There was no pre-agreement as to price or fare and so the driver carried out the fare "on the meter" as he is legally obliged to do. There was no fault with the service, we were prompt, the car was a 62 plate, the driver was clean tidy and experienced. The passenger e-mailed this morning to say the fare was "excessive" "exorbitant" and a rip off and that other companies could have done it cheaper. We politeley explained the fare was correct and that it could only have (legally) been done cheaper by prior agreement or by a firm from a different licensing area operating a different tariff. Threats followed to commnicate to all and sundry that we are a "rip off" and notices to that effect have been posted on all feedback pages where our listings appear. We urged the party to refer the complaint to the proper authority and provided details for Taxi Licensing. We cautioned that such posting could have a detrimental effect as any alegation of over charging goes to the heart of the integrity of our business. The party merely states that this is free speech.