Customers of a Hong Kong-based cryptocurrency exchange say they cannot withdraw money or tokens from the bourse, and at least seven have reported the matter to police. Dozens of clients have been unable to make withdrawals from Coinsuper (??) since late November last year, based on a review of messages on the firm’s official Telegram chat. Five customers said that they had filed police reports after withdrawals were apparently frozen, leaving them unable to retrieve about a combined US$55,000 of tokens and cash. Photo: Reuters The uproar around Coinsuper, backed by Pantera Capital, might fuel calls for broader regulatory oversight…