They don't care whether Germans' phone calls are tapped, the chancellor's phone is tapped or German companies are subject to industrial espionage.

Each of the above provably happened and the responses were (in descending order of their "strength"):

- the chancellor cancelling the phone contract with Verizon

- asking the US for an apology (didn't happen)

- asking the US to sign a no-spy treaty (which would be purely trust-based - no control possible and still the US refuses to sign it)

-- end of list --

Note the absence of lawsuits, demissions / resignations and "diplomatic tensions".