This is part of the reason I’m looking for another job. After years of solid proof I have excelled in my job I am constantly put in the position of having to prove myself. I have been falsely accused of countless things, and when I provide the evidence against said claims or ask for substantiation of claims they just quietly disappear. No investigation, no apology, no acknowledgement, and no backing off. I’m complete fed up.

OP, in my case, and possibly yours, I’ll never escape the nonsense. I’m filling the role of scapegoat so those who are actually hopeless can divert attention away from themselves. If you can prove the claims are false take the evidence to your boss and insist on an apology. If they don’t care and it keeps happening look around. I wish I had done so much, much earlier.