New Zealand Law
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If you hired this with a contract requiring that there was a certification that it was a ROPS machine, then if the machine did not have such a certificate, that is a breach of the contract. Any claim for a breach of contract must then show that the breach of the contract caused the loss. You must therefore show that the failure to have the certificate caused a loss in some way, if you want to use this as a defence to their claims. You can still contest their charges as being greater than you were promised as part of your defence.