Starter won't disengage

[JM6165]

I have an 2013 Audi A3 (8V), when I try to start the engine and allow the key to go from start to normal position the starter is still trying to start the engine. When I turn the key to the off position is does stop then. I have replace the Starter relay and starter, but didn't fix the problem. The next option I have is the Starter Switch and I want to ask before I remove the switch if anything else could cause this issue.

 

  Thanks James

[Magnet]

Welcome James,

Sounds that the switch is at fault. 
It’s difficult to follow the logic of replacing the starter motor ( or relay) since both were working, but being triggered when they shouldn’t be. 
Kind regards,

Gareth.