I guess most of you, commenters don't understand my situation.
So I am gonna give you two examples.
First example is that when a supervisor talks with a deaf employee about a serious issue by writing, he/she keeps written notes as evidence to be put in file.
Last example is that when a supervisor talks with a hearing employee about a serious issue by verbal, he/she can't keep anything as evidence to be put in file (no tape-recording).
Can't you see the big difference between those two examples? If you can't, that's unbelievable.