Not at all. You can make them stop saying they're open source and you can get a refund + maybe some damages if you claim to have bought their product based on t

Not at all. You can make them stop saying they're open source and you can get a refund + maybe some damages if you claim to have bought their product based on this false ad, but that's all. In no way are you ever going to convince a judge to order Zendesk to give you their code.