The responsibility of the broker if the customer wants to cancel the deal

A customer ordered goods via a sale-purchase agreement (SPA), in Kenya. The SPA has a refund and arbitration clause to be processed in Kenya. The goods are currently in transit to DXB.

The customer wants to cancel the deal and, instead of asking for a refund from the company in Kenya, he has filed a case against me in DXB for the refund. I originally introduced the buyer and seller as a broker.

How can I cancel this false case against me? What are the legal implications for me?

No money has been exchanged in DXB; the buyer paid in Kenya directly to the seller (invoice/receipt available).