This could be because TfL combines your daily charges and you've travelled to a zone where the daily cap is above £100 (applicable to a small number of daily caps). Find out what to do if you think you've been overcharged.
If the time between touching in at the start and touching out at the end of your journey is more than the maximum journey time limit, you'll be charged two maximum pay as you go fares. A single maximum fare is: up to £9.40 in Zones 1-9. up to £26.00 beyond Zone 9, including on the Heathrow Express.
Report the incident. Even if it's been a bad day for the cabbie driver, or he was just reacting to circumstances, rudeness should never be tolerated (credit miller). Contact the cab company right away and let them know what happened.
It's more than 50% cheaper than buying a paper Travelcard or single tickets with cash. Oyster cards have a daily price cap – once you reach this limit, you won't pay for any additional journeys (excluding Thames Clippers River Bus where there is no capping).
In addition, it does not affect your credit rating in any way. You have the right to challenge the registration of the debt by making an application to file (dependant on the type of contravention), either a Statutory Declaration or Witness statement, Out of Time.
You can see your journey history by signing into your TfL online account, via the TfL Oyster and contactless app or you can request a copy by calling Customer Services on 0343 222 1234 (TfL call charges).