Ps4 sold and salesman threatens me with lawyer?

I bought a Ps4 used and played a week but no account. I played Fifa with my buddy and with my sister. And wanted to resell her for money.

I posted a small ad on Facebook and wrote:

"Ps4 top condition with 3 controller." With the red controller, the touchtaste does not work everything else ok. 2 games are included "

a woman logs on Facebook and we have agreed on 200 euro.

she came to my apartment with her brother and my father was there and saw everything. The buyer has checked everything and made cds clean and fifa started to install because I pushed everything back. And he told me that he is studying something with technology and is familiar with it. At every Playsi there's a mistake list and that has seen and said everything well. I wanted to plug in the network plug so he can go online and has 2 times my offer ajar. They bought them and pushed me 200 euro into the hand.

after a week the buyer logs in and claims that the console is permanently locked and can't go online and Fifa cd is not working.

that's all about the App Messenger and have pictures of it.

they wrote me to bring the console back otherwise they will turn the lawyer on.

I wrote to them that they were on site and based my offer and did not want to go online and the cd worked.

for proof I have the following:

my buddy and has played with it and can confirm that the cd works.

me and my heaviest played with it 2 hours before the sale and the cd gind too (ps my sister is 12 years old)

My dad was also at the vzzBerkauf and can

Private purchase. Bad luck has the. Even if you pulled him over the table. He has to prove first.

Oh my god what is that german? Haha

Is that somehow important? One has understood what he is aiming for