If shoes squeak when they are new it is a fault in the manufacturing process, air has probably been trapped between a badly glued layer of the sole. Most reputable shoe outlets would exchange them (or some may refund but not me) and if a shoe aqueaks after a repair, it may be a similar problem if re-soled, but sometimes when the shoe is worked on the last it distorts ot and can cause damage to the built fabric of the upper and the base.