When you collectfrom the Cabbage Huts, you should be able to see the Rotten Cabbage drop and you should be able to see how many you have in your inventory and in the Baron’s Tent itself.
If they don’t accumulate (or drop) something is defenitly wrong. Contacting S8 support seems a good step.
It’s a shame you purchase have been so disapointing, I truly hope you get to experiance how great they can be.
Good luck!