What i learned in high school and have never ever found use full

when i was in high school in one class which i don't know the name of. For like what i think was actually two weeks straight of class's and maybe longer we worked on writing complaint letters. like if i buy a product and there's something wrong with it. I can't honestly tell you that i never ever will find a use for this. like honestly like i could bring up math or something but this i can not find why i needed to learn that. We even had a whole class about how these letters would actually get the comapines attention rather then calling. I think the teachers name was Mr. Orwig and i remember he got mad at me for not taking the assignment seriously.
I don't even know anyone who has done that . in fact i don't know anyone who knows someone who has written a complaint letter. in fact i don't know anyone who has ever heard of anyone who has written a complaint letter even like heard someone on the subway or walking by them. like never ever. i don't know maybe in ten years i'll think yeah i need to use what i learned from mr. orwig and write that complaint letter.