2007 RAV4 brakes - fixed for sure?

Well, the beat goes on - looks like the mechanic put the wrong transmission fluid in. He was stating to me with confidence that he uses only Toyota products, “T4”. I went home, looked it up, and that’s the wrong stuff, it’s supposed to be “WS”.

I called up the area Toyota dealer the next day, they said to bring it right in for a flush and to replace the fluid. $$$$. They said they weren’t sure if there was damage or not. I did not notice any shifting issues; I only had driven about 25-30 miles in the interim.

Do I have a new issue?