Why is the speed of sound in air constant (relative to temperature) when the wave speed formula is Vwave = fλ? [duplicate]

By the logic of the wave speed equation, shouldn't a 1000 Hz sound travel twice as fast as a 500 Hz sound? I know it doesn't, but why not?

What the frequency does change is where in space the pressure of one localised region is $$2\pi, 4\pi$$ etc out of phase with another localised region and the distance between two such localised regions is an integer times a wavelength.