whats the estimated cost to replace an ingition switch on 2001 Chevrolet Monte Carlo

my monte carlo air conditioning and heating did not work, i took it to a shop for a repair and paid 700.00 to get a new blower motor and controls replaces. a few days later it did not work again, i took it back to the same shop and now they are socking me with a 400 dollar bill to replace a starter switch. Thesy said electrical problems are hard to diagnose and they have to use the process of elimination and that the starter switch can cause the malfunctiuon?

1 answer
WHTA ARE YOU CALLING A STARTER SWITCH? KEY AND TUMPER, IGNITION SWITCH, WHAT DO THEY CALL THE PART EXACTLY