My professor is stalking me what should I do?

I had a math class in fall 2016, I was struggling in that class, my prof once asked me for my phone number stating I can call him for help ( so for professional purposes) so I gave him my number then he left my a mess call, however, he called me later to go out. Then the next day I dropped the class, but since September 2016 until now I receive call and text messages from him, I do not reply back. He used to text me and call on viber app, I removed the app, then went to whats app, I removed it, and now on my phone, I blocked him but still leaving me a voice messages. I was thinking to inform the university dean about what is going on. but I do not want to report this thing, reporting is a serious pain and I do not wan to go through it is my last year, I want it to end up peacefully. but I need to let someone from the dean know about this with filing and report.. can I do that?
My professor is stalking me what should I do?
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