Bathtub won't drain. Not clogged, used Drano, clothes hanger, snake..nothing works.?

About 4 months ago, hubby changed out washers on faucets and outflow due to leak. Now outflow won't completely shut off when shower is in use, water keeps running through spigot. Usu. have about 3 inches of water when I'm finished in the tub. Uck!!
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