I live in Denver and my house is set back far into my yard. There is a large gate in the front and a no trespassing sign. A process server came to serve me for a speed van ticket and I accepted the service and then advised him not to ever come back, for I have a no trespassing sign. He came back a few weeks later with a separate speeding ticket. I was in the front yard and he came up towards my property and I told him he was warned not to come on the property. He then stepped up to the fence (my fence is a few feet into my property) and left the ticket. I got his license plate number and vehicle type. The police who work the photo enforcement unit told me I was arguing semantics and was unwilling to help me find out how to file charges. I believe they are targeting me, what are my options?