Professor ignoring emails and not attending office hours
If you are feeling desperate, go to the department office and tell them you need to contact the professor over a grading issue that you are afraid will slip through the cracks at end of term. Ask to have them have the professor contact you, leaving contact information. You could even write a note for the office to pass to the professor detailing your concerns. The office is likely to see the professor before you do. 

The prof may still not respond, but you have left a marker that establishes your timely concern. 

Don't be overly concerned about lack of response at end of term. There may be a lot on the professor's plate also. There are also ways to work things out that don't require immediate action, as long as you leave a trail of effort to contact and resolve the issue. 

But don't increase the "noise" going directly to the professor. It probably won't help and might hurt.