I think you may have answered your own question. The tenant has always been late, but is now over 8wks/2months in arrears. Refuses to pay the increase and has ceased contact.
You have a verbal intention of leaving with no evidence to terminate.
As long as you're not banging on the door at midnight then harassment is unlikely. Send a strongly worded reminder,issue the correct notices pending court action and go ahead with a possession hearing. At least this will award a money judgment and a possession date which can be enforced later. Highly unlikely you'll ever actualy see your money, but you now need to concentrate on getting your property back.
I may be a housing professional but my views, thoughts, opinions, advice, criticisms or otherwise on this board are mine and are not representative of my company, colleagues, managers. I am here as an independent human being who simply wants to learn new stuff, share ideas and interact with like minded people.