Tenant being unresponsive in regards to garage rental

[John Cashway]

Hello,

I rent out several garages. One of the tenants has not paid april or may, and I fear it will be the same with June. 

1. I had spoken to the tenant in april when it became late (the tenant was never late with me before), the tenant stated they are out of the area and will pay on a specific date in mid-late aril when they arrive back (I do accept electronic payment). 

2.The date came and went, I called and left a message, never received a call back. 

3.I followed up via text when May became late. This time the tenant responded stating they never came back, but is willing to mail me cash or money order. I responded that electronic payment is more secure as the money doesn't get lost that way, therefore there would be no argument with who is liable for the lost money.

4. Two weeks go by and I never heard back. I tried calling, left a message and texted stating I never received a response on how he'd like to go about this.

From my understanding rental laws are different between a living quarters and something like a garage, but I cannot find anything about the steps I would need to follow. What should I be doing at this point? I feel as if this tenant will continue ignoring me. Any suggestions on a lawyer (Jersey city, NJ) who can give me some guidance in resolving the issue? Or other suggestions?