code: def unget_service(self, bundle, reference, service=None):
          # type: (Any, ServiceReference, Any) -> bool
          
          with self.__svc_lock:
              if reference.is_prototype():
                  return self.__unget_service_from_factory(
                      bundle, reference, service
                  )
              elif reference.is_factory():
                  return self.__unget_service_from_factory(bundle, reference)
  
              try:
                  # Remove the service reference from the bundle
                  imports = self.__bundle_imports[bundle]
                  if not imports[reference].dec():
                      # No more reference to it
                      del imports[reference]
              except KeyError:
                  # Unknown reference
                  return False
              else:
                  # Clean up
                  if not imports:
                      del self.__bundle_imports[bundle]
  
                  # Update the service reference
                  reference.unused_by(bundle)
                  return True
docs: Removes the usage of a service by a bundle
  
          :param bundle: The bundle that used the service
          :param reference: A service reference
          :param service: Service instance (for Prototype Service Factories)
          :return: True if the bundle usage has been removed