I sense that your are feeling frustrated about what you described. I think I would likely be at least a little frustrated, too. Let's remember that this is a public forum and keep any expression of such emotions in appropriate terms and tone. Let me see if I can shed a little light on both the issues I saw in your post.
First, being released from a calling without being personally informed: Handbook 2 has guidance on how releases from callings _should_ be handled. Handbook 2 (not 1) is publicly available, so here is where you can find the relevant section:
https://www.lds.org/handbook/handbook-2 ... ng=eng#195
Second, being moved to the YSA ward: There may well be instructions in the handbooks about how members are moved to a YSA ward when they turn 18 and/or graduate from high school, but I'm not personally acquainted with those instructions. Someone else may chime in with more information from official sources. I do know that the two stakes I have lived in during the past few decades differ a little bit in their culture on that topic. In one stake, the new adults/graduates generally made a deliberate decision of where they would attend, and the records were moved accordingly. In another stake, everyone simply assumes a new adult/graduate will be moved to the YSA ward. Perhaps that might be new policy--I don't know.
One thing I do know regarding both issues is that mistakes happen, even when all leaders, clerks, and everyone else has the best of intentions. Having served as an elders quorum secretary and now serving as ward membership clerk, I have made my share of mistakes with just a couple of errant keystrokes or mouse button presses when updating home teaching (now ministering) assignments--like the time I inadvertently unassigned a single sister's home teachers from the high priests group. Her father was in the high priests group leadership, so I had to go ask him who his daughter's home teachers were supposed to be so I (or someone more reliable) could fix my mistake. Also, leaders have a lot of things to try to keep track of, and sometimes something falls through the cracks.
I would suggest you talk with someone in the bishopric of your home ward and/or YSA ward about your concerns. I'd guess there's a fair chance you'll get an apology.