Can i sue merchant services and POS company for not sending me my funds for a months worth of transactions?

I am a franchisee of a desert place. recently i discovered that one months of credit cards transactions totaling 18K didn't make it to my bank account. Also, that credit cards were getting stored in the POS and getting denied during batch settlement phases. After reaching out to all of the right parties i am being left in the dark for almost a month since my initial discovery.