Unless the terms of any contract between the relative mill and relative grower provide otherwise, if a mill is dissatisfied with the condition of cane delivered to it by a grower and does not wish to accept such cane, it shall refer the matter to the Mill Group Board concerned. If, in any such matter referred to it by a mill, the Mill Group Board concerned is satisfied that the condition of the cane is so defective that the mill concerned cannot efficiently crush the same, the Mill Group Board concerned shall order the cane to be redelivered to the grower concerned at the grower's expense, regardless of whether or not it has been weighed, in which event the grower shall not receive any payment therefor. A Mill Group Board may delegate any of its functions in terms of this clause to a nominee.