Guy Retaliates After Being Scammed of N5k by a Girl he Met Online

I guess she must have learnt her lesson by now. I met this girl on a social media platform and we were getting along well as she happened to be a responsive chat-mate.
This past Saturday, I noticed she wasn't so much responding to my chats and as a friend, I asked what the problem was. She came with the excuse that she lost N5000 after withdrawing it at the ATM and that was the last cash she had on her. I offered to help and we scheduled a meeting at a lounge in my estate.  To cut the long story short, i transferred the cash to her account before we left the lounge. On the way out, she asked me to excuse her that she needed to use the rest room. She dropped her phone with me and while she was away, the transaction alert came in. This girl had nothing less than 25,000# in her account. Well no problem. While she got back, I told her an alert message came in from the bank, that the transaction is completed. Her countenance changed immediately. Though it wasn't much of a cash to me, but what she did after ward actually got me furious. She wasn't picking my phone and she later blocked me on Whatsapp. Just yesterday, I decided to be childish. I placed an ad on OLX of a Fairly used Iphone6 for N60,000 and set her number on it.
I received about 30 messages on OLX yesterday telling me the number I placed was wrong that it was a lady picking up. I will renew the advert today. In her life she will never mess with a gentle guy like me