Urgent Mediation Needed for Payment Dispute

I'm in urgent need of a skilled mediator. I worked with Brett for seven months under a contract aimed at expanding his audience and revenue. Despite achieving substantial milestones, including $33k from a webinar, Brett has refused to pay the agreed percentage. He also owes me $3k, which he initially claimed was stuck in Payoneer, but later admitted he would only pay when funds are available. My objective is to recover the owed money as swiftly as possible. The delays, lack of transparency, and refusal to provide proof of transactions have led to immense frustration and mental stress over the past two months, leaving me in financial distress. I have a contract and communication records that support my claims. I'm seeking a mediator who can facilitate this situation and help me secure the money I'm owed.