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There are a series of small brass "buttons" on the outside bottom of the lens where contact is established. If a new lens, there may be some dirt or grease on them preventing contack. Wipe lens and camera buttons carefully with a lent free cloth and retry. Then it is time to go back to the seller.
Aperture problems on this lens are normally caused by grease on the diaphragm blades. The only solution is to dismantle from the back. When the iris is exposed wipe over with lint free cloth or cotton buds with a small drop of solvent such as lightr fuel or meths. Wipe over with a dry cloth afterwards. Get used to how to dismantle and reassemble the lens, you might have to do this more than once.
Please take your lens to a certified dealer. They can take it apart in a clean environment.
You should not try to clean / relubricate it at home, as this will most possibly do permanent damage to your lens.
The 80s 167MT uses good old fashioned mechanical links between the camera body and lens. Remove the lens, and press the depth of field button. If you don't see the lever that connects the aperture control from in the camera body to the lens move, then something's obviouly broken in the camera body.
Any way you want. The problem with fungus is that it etches the glass, which then has to be replaced. Unless you can find a stockpile of Contax 50mm f/1.7 Planar T* lenses for a replacement part, you'll have to buy another lens.
Let alone the recalibrating after replacing the lens element.