I made a first complaint to Amazon, thinking that there had been an error in the preparation of the package. Amazon quickly sent me a new package, but it still contained a roll.
I deduce that the set of 6 does not exist, and that qualifying matches only a single roll. There would be a mistake in the description of this product on the site.
The roll worth a handful of euros, I did not insist further, but I'm not sure to recommend this product in the future.