Customers in Kent have been left without their food shopping today after a major supermarket is facing a technical error with payments. Sainsbury’s was hit with the problem overnight after a software update, meaning no Kent stores can take contactless payments. Despite this, the supermarket remains open as usual but customers can only pay by using cash or chip and pin. The problem has subsequently sparked debate online about the importance of cash. “Quite a few places refuse to take cash,” Stephen Kennett wrote on an Ashford Facebook group. “This demonstrates the need for cash payments to be a…