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Your contract of purchase is with the dealer from whom you bought your Mojo - the same applies to any purchase of any item from any dealer.
So legally you need to try and sort things out through your dealer - you have no purchase contract with Chord, so they are not trying to avoid their responsibilities.
This may be correct for France, but that does not describe the laws in the United States. Manufactures warranty their products and determine the process for obtaining warranty service. Some, like Chord, require their authorized retailers to be the first step in that process while others, like AK and Onyko, use regional service centers to provide warranty service. Sometimes a retailer may help you get to the service center but that depends on their relationship with the manufacturer which may be defined by their retailer agreement or may not. Best approach is to follow the manufacturer's instructions in the owners manual or on their website.