I took my vehicle in for servicing, and I was informed that a faulty part, namely the coolant, needed to be replaced

I took my vehicle in for servicing, and I was informed that a faulty part, namely the coolant, needed to be replaced. Regrettably, I was informed that this specific part was not readily available and would have to be ordered from Germany, resulting in an estimated wait time of approximately two weeks. This has left me without a car; I filed a claim last Wednesday, and the agent in charge of my case has yet to deliver on his promises. Every time I call, I am told that he has left and will return.