Posted By: Sooo...YouWanna
What do I do if TER won't let me change my profile, because an email needs to be sent from the agency releasing it and confirming that I'm independent now? Obviously, they have not done that.
They're also refusing to give me my pictures, that I paid good money for

This problem has come up before and I'm trying to remember the solution. I don't know what DOES work but this MIGHT work.
Provide PROOF to TER that you are you and are now indy: candid photo holding a "Hay, TER, it's really me!" sign that matches you to your ad pics? Maybe TER will even contact the agency if you make your case strongly enough.
If you CHANGE NAMES AND CONTACT INFO ("Susan" TER ID 123456 becomes "Mary") and get a new review and a new Profile it should be EASY to merge the two Profiles into one, and force the removal (or at least subordination) of the agency info to your new info.
That is: post new ads with new pics but that match you in appearance (even try the same outfit and same pose!). Use a new name ("Mary"). Mary gets a new review and Profile (Mary TER ID 987654).
Now someone submits a Problem Report and says: "Mary 987654 is the same person as Susan 123456. Compare the pictures. Same girl! New contact info. Merge into one." If TER agrees that new Mary is old Susan, they move the new reviews to Susan 123456, change the name on 123456 to "Mary / Susan", change the URLs to the new URLs and the phone info, etc. and DELETE the duplicate 987654 Profile.
At that point, it should be easier for you to control your own TER ID Profile