Buyer giving pressure, What should I do?

[arefinfaysaldu]

Hello, I am a new seller in Fiverr. I am a digital marketer. One of my gig is about making chatbot for website and Facebook Messenger. I have some experience about making chatbot.
Yesterday I delivered a Website chatbot to my buyer. After confirmation of buyer that everything is ok I had told him to change all of the password. Then he tolf me plz add this, plz add those etc.
Today he is claimed that his website is going down, hi is facing server problem. But I am not at all exparte about website. I have already told him to change all of the password. But he think that I am working in his website. But I am not working in his website and told him to change password. In this time what should I do?

[vladsurmjolk]

This is a problem on the server side, not yours.

[arefinfaysaldu]

This is a problem on the server side, not yours.

I can understand. But buyer is not trying to understand. He is blaming me continuously. He is also threating me to report fiverr authority against me. What should I do?