Franchisee not made payment as per the agreement

Dear Sir, I have taken franchisee of Abirami Rice. It is under COCO model (Company Owned and Company Operated). We have to just invest money and in return, they will pay 2% of sales commission or 14% on Total investment (Which ever is higher). We have entered in to agreement in Mar 2018. Sales were not high so they have to pay the minimum guarantee (14% on Total Investment). But they have not paid for more than a year. Kindly advise me in this regard.