Is it a good idea to escalate if my masters advisor is incompetent? I would like to know whether to escalate the issue when my masters thesis advisor is very careless, disorganized and does not provide anything useful to me.

I have started with him around 9 months ago. Following some disappointment over his choice of research topic, I have worked very hard, and now, after 9 months of my research, I am almost done.

However, my advisor is very unresponsive to me:


I have sent him tons of emails with no responses. 
I have requested to meet him more than 15 times and I was only able to see him 3 times. However, he has confirmed most of these appointments and I ended by wasting my time waiting him in front of his office for 30 -60 minutes before I got the same exact answer every time (I have emergency case sorry)
Last week I was able to meet with him, and he did not remember the topic or when I have to defend my thesis. (I have sent him more than 10 drafts of my work during the last 9 months.)
Now, he promised to review my work and give me his feedback by end of Saturday. today is Sunday and I still did not hear from him.


Is it better to escalate the case? Or live with it for the time being and wait for my thesis result? 

If I try to escalate later, will they ask me, why you did not speak before, it is too late now?
I think you should find a new advisor.  You should definitely discuss the situation with an appropriate faculty member, perhaps the one in charge of the master's program, so that nobody will think you were not proactive in solving your problems.  

The word "escalate" is vague and negative.  Don't use it.