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If the developer will not fix the software so it meets the standards of the contract for the development of the software you will need to get another company to make the necessary fixes. You can then sue the original developer for all the additional costs you incurred in getting the necessary fixes that exceeds the original contract price. You may also be entitled to additional damages that you may have suffered for the non performance but that will depend on the terms of the original contract and the nature of the damages you suffered.
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