Amazon (AMZN.US) is exposed to "screwing over" delivery contractors: an app error causing small business owners to bear sky-high repair costs.

According to the "Zhitong Finance and Economics" app, Amazon (AMZN.US) is planning to update its aging blue delivery fleet, but small business owners who use these vehicles to transport packages say they are facing unexpected repair bills of over $20,000 per vehicle, a cost they cannot afford and are caught off guard by.