Hello, I was caught using my friends dads friends 60+ oyster, he had full knowledge that I had it. It was my only time using it as my oyster had been expired and the TFL website was down, I also had a normal oyster, but the credit finished and I had no cash on me to top it up in the station. A TFL officer approached me and asked me to hand over the oyster which I did and then proceeded to take down my details and told me that I would recieve a letter. This happened in St Pauls station. I am panicking a lot as I have not recieved a letter yet and dont know what will happen. Does anyone have any ideas or advice?