The turn lever is part of the Combination Switch Assembly.
New combi switch = $$$$$. Find a used one.
I recently replaced mine because the one of the contacts for the wires that activate the airbag became faulty. It's not too hard, but you will need a security torx bit (a torx with a hole in the centre).
It took me about 2 hours, and I found one of the bolts that hold the plate directly underneath the steering column stuck. I ended up unscrewing the ignition and wiggle the wire thru a very tight gap around the ignition. Other than that, it wasn't too bad, although you will be working upside down underneath the steering column for most of the time.
I have my old combi switch laying around somewhere. I was going to take it apart to see how it worked at some point, but if you can scavenge it, we can talk.
VK