Been there, done that, got the solution:
Strut Install Fail, need help.
Simply put, the instructions in the manuals direct you to pressurize the system before putting weight on the suspension after installation. That is the step I missed, and I suspect your shop did the same. If that is the case, assuming the shock hasn't been damaged from the air bladder binding up, the rear end can be jacked up, wheels hanging in the air, the ELC system then needs to be triggered (this can be done with ignition on, and manipulating the level arm). Wheels go back on the ground, and the rear end should now be jacked up by the air system, and as the car comes back down on its own, keep working the suspension until it comes to a full rest. If all goes well, the problem will be fixed.
Suggestion: have the mechanic recount the installation, and find out if he missed a step. Before doing this, I would confirm that installation instructions were included with the shocks. If there was, and you can find them, that can help you as well.