How to proceed when a professor is not answering emails requesting for a grade? and not awarding bonus points as he said?
Yes, contact the ombudsperson, student office or office of graduate studies about this. If several of you do so then it’ll probably make the department push the Professor to do their job. Professors often see their teaching duties as secondary but this seems particularly egregious. 

Hope it gets straightened out. I had a professor who failed to submit grades for nearly a year, eventually the entire class got an A- blanket grade which was infuriating.