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Wait until the calla leaves have turned yellow to cut them down. Meanwhile, you can support the plants with a couple sticks and twine or a traditional plant support, available at box stores and garden centers.

Calla lily is an interesting plant, biologically speaking. The "flowers" are really modified leaves that curl around the true, and inconspicuous, real flower. It sounds like a few leaves missed curling into the tubular flower. I don't know why that would occur but if it persists, you'll need to replace them because they are defective. Whether this is the result of herbicide damage or diseased tuber/rhizome, I don't know. Calla with solid-colored leaves like lots of moisture - almost boggy conditions. Those with speckled leaves like moist soil but not as wet as their cousins. I'd love to see a picture!

Your calla lily should be up by now. Were the rhizomes firm and free of soft spots and mold when planted? They can develop rot in soil that is too wet. If you have heavy clay, amend with peat, coarse sand or perlite to improve drainage. Calla are planted shallowly unlike most other bulbs/rhizomes. I would carefully try to dig one up to see what is going on.

Colorful, open flowers attract pollinators but also call attention to the seed-head which critters might like to eat. So Calla lily blooms turn green and close in order to protect/camouflage developing seeds. Cutting the stems down to the base encourages more blooming.

Calla lily likes consistently moist, well-draining soil. The clump will slowly enlarge as the rhizome gets bigger every year. My calla do fine in clay amended with peat moss. They will not do well in sandy soil. More info here: https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/growing-calla-lilies-and-care-of-calla-lilies.htm

What is your USDA zone? This can determine whether these are hardy in your area or not. This article will help in the meantime: https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/growing-calla-lilies-and-care-of-calla-lilies.htm