There is software that can remove colour fringes, but if the lens produces them, it's better to fix it at the source.

Look for a setting on the camera to tell it hat accessory is attached.
My Minolta A2 and Canon G9, have settings for lens accessories to tell the camera's software what you've screwed onto the front.
It could be that you're using zoom settings that are incompatible with the accessory lens, too much telephoto zoom might be the cause. When you tell the camera what you've got on the lens, then it restricts the zoom to a safe range.

Other than that, I'd go back to the Sony store with these examples.