Internet shipbrokerage Levelseas is seeking to recoup payments from a sacked software developer, a move that illustrates the frustration many Internet start-ups have suffered in targeting the complex shipping industry. "The key to the issue is that they say the product works and we say it doesn't," Levelseas COO Kevin O'Connor said. "At the end of February we realized that CSC was unusable and we haven't used a single line of specification... or a single code," he added. CSC was unavailable to comment on Tuesday. Levelseas took the development of the world's first Internet ship-brokerage in-house in February and launched the finished product at the start of last month.