Judging by some of the posts from owner/ drivers over the past few years, some dealers seem to know less than readers of the forum. I suggest that you raise the issue so they can find and read the TSB before they start work.
Faults and Technical chat for the Citroen C4 Cactus
Yes. When ever there is a campaign concerning your VIN, that will "illuminate" a flag on your dealer 's computer and he will have to carry it out and announce the manufacturer accordingly, regardless of the reason for which you've entered the garage for.
1.2 Puretech 110 Turbo Red with Black Airbumps and Habana interior