Is it legal for an officer or judge to change a traffic citation & make it a larger fine if I plead not guilty?

Because the cop said he was giving me a huge break. The officer pulled me over and said I was speeding doing 81 in a 65, said he got me on radar. He said that he was giving me a huge break when he gave me the ticket and said he was saving me a lot of money and points on my license by writing the ticket a different way and he checked off the other box under offense and said regulation of traffic on PA Turnpike and remarked below that under charge exceeded maximum speed but did not write the speed I was going but wrote something in the remarks section saying MLA +16. I called the Magisterial District on my citation where I received the traffic ticket and I asked her if I plead guilty, Will I get points on my license and she said no, that that's why the officer wrote the ticket the way he did to give me a break so that I would not receive points, She then said if I contest the ticket and take it to trial that the officer will then take back the break he was giving me and change the citation to a speeding ticket for doing 81 in a 65 and I will be essed 4 points against my license and the ticket will be more money of course too if I decide to plead not guilty and fight the ticket. Can anyone please tell me if this is legal? Can they really do this if I plead not guilty and at trial make it worse for me than it is right now by increasing my fine to speeding 16 miles over the maximum speed and essing 4 points against my license? Do they really do this? Is it legal?