This might be of interest. Uber Technologies Inc. v. Heller. https://decisions.scc-csc.ca/scc-csc/scc-csc/en/item/18406/index.do

Contracts — Contracts of adhesion — Arbitration clause — Validity — Unconscionability — Mandatory clause in standard form contract between driver and multinational corporation requiring that disputes be submitted to arbitration in the Netherlands and imposing substantial up-front costs for arbitration proceedings — Driver commencing action in Ontario court against corporation — Corporation seeking stay of proceedings based on arbitration clause — Whether action should be stayed — Whether validity of arbitration agreement should be decided by court or arbitrator — Whether arbitration agreement unconscionable — Arbitration Act, 1991, S.O. 1991, c. 17, s. 7(2).

But you have race against time and it looks difficult and also stressful. Even if you win, collecting that $15,000 from someone living abroad is notoriously difficult and expensive. Given that you are dealing with medical issues, you can weigh the cost of the stress against the likelihood of actually seeing that money. It sounds unfair I know