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Unfortunately, there isn't enough information for me to answer. Are they in the ground, in containers, is the soil consistently moist, how long ago did you plant them??? If you transplanted them less than a week ago, you are probably seeing transplant stress, not something you did wrong. During this time, keep them in the shade and move them to full sun gradually when they look better. If these are in the ground, create some shade for them. Use a box, a leaf bag over a shovel or cloth tied to sticks to block afternoon sun under they look better. Where you live also affects calla lily performance. My sister in the Pacific NW has calla that go dormant during their dry summers. I'm in Michigan and mine are beautiful all summer if I keep them watered. The classic white calla with dark green leaves go grow well in wet, soggy soil. Other varieties need moist soil that isn't soggy. Here is more info. Note that the sidebar on the right has links to further calla topics. https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/growing-calla-lilies-and-care-of-calla-lilies.htm

This sounds like the natural aging process of your plant.
This article will help you.

https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/green-calla-lily-blooms.htm

It would be best to move them when they are dormant. It would also be a good time to divide them!

https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/transplanting-calla-lilies.htm
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/dividing-calla-lilies.htm

This article will help you.

https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/calla-buds-dont-open.htm

The most common reasons for non-blooming are tubers that haven't reached bloom size yet, too much nitrogen and not enough sunlight. Here is an article that discusses the issue: https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/make-calla-lily-bloom.htm

The 3 most common reasons for non-blooming calla lily are 1. not enough direct sunlight; 2. too much nitrogen in your fertilizer; bulb is too small to bloom. If you planted a fist-sized bulb then #3 is not the reason. Calla love sunlight but they also want moist soil. If your calla is in a container, it may not have gone through the necessary dormant period. Since calla lily is only winter hardy in zones 8-10, most gardeners dig up the bulbs before the first frost and store them over winter like glad bulbs. If you leave them in their container, stop watering and let it go dormant for 2 long months before bringing it into light and resuming watering. It will need artificial light as winter sun is not potent, even a south window is inadequate. Alternatively, wait until the weather warms and bring the plant out of dormancy outside. Don't be in a rush; calla is a tropical plant and does not like night-time temps below 50F.