Amazon is facing a class-action lawsuit alleging that the company has been reversing some instant refunds issued to customers after product returns. While Amazon maintains that refunds are processed automatically, several customers claim their refunds were rescinded, prompting legal action challenging Amazon's advanced refund policy. Additionally, a separate case before the South Carolina Supreme Court could potentially cost Amazon Services LLC approximately $150 million, highlighting challenges related to the application of pre-internet tax laws to online platforms.