It seems that what your car rental company has charged you is the administration fee for passing on

We received receipts from them looking like they had paid it. The following month, we received a penalty charge notice stating we needed to pay £65. I paid the US dollar equivalent – $105.10. Then they demanded the same again. Today, I received a notice that we owe $210.22 more.
It seems that what your car rental company has charged you is the administration fee for passing on your hire details to Transport for London (TfL), rather than the fine itself. According new york hotel casino to TfL, you actually strayed into the congestion zone twice during your sightseeing tour, which is why you received new york hotel casino two penalty notices. Then, because the payments were received after the two-week discount period had expired, you were given a charge certificate which required an extra £130.
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