Can a company legally withhold payment to a vendor after services have been rendered?

Question Details: My company an LLC was previously under contract with another in which they contracted with my company to provide services and payment was determined by commission earned and fee-for-services rendered. After submitting the final invoice in the course of terminating the contract, the company claimed it was not going to pay the final invoice until a complete "audit and investigation" was completed. My company has done nothing wrong, we simply decided to move on so that we could grow. There is no contract language about any payment withholding, audits, investigations, etc. It has been over a month, they are still refusing to pay commission and fees for services that were agreed to. What is our recourse?

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