Stoves have wrong extra serving amount

I have bought 9 of those packages with 2 stoves cook 50% faster + 2 stoves cook 50% more servings. I discovered they they only cook 35% more servings. I paid for those and that upset me. Please know that all of the stoves that say they give you more servings are inaccurate. Whether you win it, or pay for it, the percentage is incorrect.  I’ve sent a ticket and was told that the developers are currently working on the issue. That was 8 days ago. Nothing has changed, and I haven’t been notified of anything.