Paypal seller issue

[Cr_Dev]

Hello Community,

I am an agency owner and we are working with one of the clients.

The Client paid us $500 on  22nd April and today is 22nd May, we worked with him for 30 days and now he is asking for a refund.

Even though the work is done. As it was an SEO-related project and it takes time to rank he is not ready to understand it.

He is harassing me to dispute and warning me of legal backlash.
What can I do now?

[Zulhamree]

Claim

[Teito23]

Did they open a dispute case on you and is it item not as described/or not received? 
If it is provided the tracking information and other information that states otherwise that you have given them the goods/services that they paid for to paypal. Also if they have not it means they know that they are trying to threaten and scare you into refunding the payment that they know they cannot win the case for.