Sold a guy a iphone on craiglist, guy claims it doesn't work?

I sold my Iphone 5 on craigslistwhich was unlocked for tmobile. I used it for tmobile and it had no problems. Now the same day i sold it, he called me saying " i have no service with my tmobile sim card in why did you sold me this etc etc" ( he told me he went to tmobile to buy a new nano sim card )now when i had the iphone it worked prefectly. Alot of people told me to ignore him and not to take back the phone and give his money because i didn't sell the phone like that ( i sold it working prefect ) now he knows where i live. So please tell me what to do? Phone worked great when i had it. Now that he has it its been saying No service sense.
I currently blocked him from texting me and calling me

If you have the IMEI of the phone, run it through T-Mobile and see if the IMEI is blocked. If it's not blocked, then the buyer is lying.

The terms you need to remember to add to your offers is:
Sold without guarantee/warranty as seen.

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