I was kinda amazed at how bad it was.
So I sent an e-mail to the CEO, I still had his contact and when I worked there I had a lot of freedom to talk to him and whatnot and had his personal e-mail.
I explained in the e-mail his HR was attempting to recruit me back, and if he had changed his mind and wanted me back I would accept it, but if not, at least he should take a look at the quality of the .doc his HR created.
He e-mailed me back some days later, said my e-mail made him go and check what the HR department is doing, he found out they all are being incompetent, so he fired all of them and hired a new HR, he said he doesn't want me back, but thanked me for fixing his HR, and promised such unprofessional approach wouldn't happen again.
EDIT: for those thinking firing HR was too harsh, just some more context: they e-mailed me a .doc out of the blue, with bad questions and bad formatting, they didn't told me what job I "applied" for (and I didn't apply for a job in first place), they never said what the company wanted, or what the job was or anything, and they acted in a kinda arrogant manner, as if they were HR of a FAANG company, something like: "Oh, complete this document, and if you pass we will inform you when the next interview will take place, you have 36h to complete this." Also, somehow the .doc was the third inverview, somehow I passed the first two?