(Bloomberg) -- A proposed deal to restructure one of the largest piles of US distressed debt is drawing ire from creditors who have been left out of the transaction. Lumen Technologies Inc., a struggling telecommunications firm with nearly $20 billion of debt, cut the deal with a group of investment firms including Silver Point Capital, Pacific Investment Management Co., Diameter Capital Partners and Blackrock Inc., according to people with knowledge of the matter who asked not to be identified because talks are private.