Who is providing mediation/arbitration? Is this through a consumer or government agency or is this something contractually required? (Arbitration clause.)
I’m not a fan of arbitration clauses. We learned the hard way that if the other party doesn’t pay their portion of the fees – the arbitration screeches to a halt. Your choice is walk away (and lose your portion of the fees you’ve paid) or pay their fees for them. And there’s no recourse (appeal). If the arbitrator makes a decision pulled out of their ass… oh well. They could make a decision that because it’s Tuesday that the person with the alphabetical first letter of the name wins… nothing you could do about it. No appealing to a higher court.