ask for the diagnosis test log from them and the parts list and ask them if their "orange workshop key" starts the car.
The USD 1100/- module is the drive authorization module, I have only seen ONE car on which it had gone bad and that was due to water damage. The module cannot be bought used as it is coded only once from MB in Sindelfingen and is then permanently married to the car. It can take 10 keys in its lifetime.
I suggest you check the key first, it is known for MB keys to lose their function - (usually due to tight jeans pockets or cosmetic spill over in ladies purses), a new key usually solves such phantom failures and Shahnawaz Ltd are known for taking wallets on a ride.
btw does the car function at all? any message display on the guages when you attempt to spin the key?