Is it harassment if one person target you all the time and poke you in the front of your office colleague?

I’m working in a publishing company an executive. My boss always blame me for all the things and he all the time only target me. When I told this things to my VP and HR department, they are saying this is not a part of harassment and I am not a mature person that's why I am saying this. Could you tell me what is harassment? That's why I want give resignation to my company without noticed period. They are saying that if I am have not completed my notice period, then company deduct my 45 days salary.