I'd start writing letters to the school board, to the Karati company, to the billing company, etc. But I think it is time you read the contract you signed. The fact is that they had a duty to keep your son safe. They failed. You cannot entrust them with your son's welfare after even ONE failed pickup. The billing company is not who you contracted with... you contracted with the Karati school. Verify this please. Both of them are liable for keeping your son safe if they are in this business together. I seriously doubt any judge would hold you to a breached contract... So 1st option) get a lawyer to write two letters restating that they breached the contract by leaving your son at the school and cancelling the contract due to that fundamental breach of fiduciary duty. You will be daring them to take you to court. OR 2nd option)It is probably small claims, so be ready to potentially take them there yourself to get the contract voided at a cost of under $100.