WOW $1,100.00 to replace the mulitfunction switch is a little out there. The labor to replace the switch is only around 3.5 to 4 hours. Plus the cost of the switch, that some how does not add up, sounds like you got a little taken. Sorry. Now to proceed
Now to really be helpful, I would like to see what faults they got, I would suggest that you contact the dealer and ask for a copy of the printout of faults. Range sensor does not make sense, but may be something else which if I am correct would mean the trans is done. If possible please post the faults so that we can go further.