What to do when the reviewer of a conference submission provides very negative ratings and almost no comments?
Lack of meaningful review feedback is absolutely abnormal and inappropriate behavior for a good computer science conference (I am guessing computer science based on your prior posts).  The late response and lack of email are within normal variance, though.

Unfortunately, what this probably means is that the conference you submitted to is actually a crap conference.  Re-investigate the conference, and evaluate its quality again: just because something is international doesn't mean it is good.  Even being sponsored by a major society like IEEE may not ensure quality.  Look at who is involved and the level of citation of past work, etc.  If the conference is a crap conference, you should feel thankful that they rejected your paper and you have an opportunity to submit to a better conference instead.

If, on the other hand, despite all expectation it is actually a good conference, then you should write to the program chairs and ask to receive a real peer review.  Every author deserves meaningful feedback on your paper, no matter how bad the paper may be (and I speak as one who has even given a serious review to a submission from a clearly insane individual).