I already cancelled my tag, why I have pay again?

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I just don't understand. Last year, I already cancelled the trailer registration with the local tag office, and they shouldn't send renewal notification to me this year. Which the fee is $4.45, but I no longer have this trailer, and it is sold. That just trouble me some. I already told the lady who work at the tag office last year, that I no longer possess this trailer, so, I need to cancel this registration. Today, I received this bill again, and it is like mandatory or something. I might have to go up there myself, and talk to those people again. Does it happen to anyone here? Did cancel your vehicle tag registration, and they send you a bill again next year?