Q.canna leaves
looks like I have some sort of beatle eating the leaves. What can I do to get rid of them and save my plant?

There are a few pests that can attack Canna Lily, including, Aphids, Japanese Beetle, Canna Leafroller, and numerous caterpillars.
Pick off any caterpillars or Japanese Beetles that are visible.
If you can't see a pest, it could be Aphids or slugs.
Here are some links that will help you.
https://www.gardeningknowhow.com/ornamental/bulbs/canna/canna-lily-care.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/japanese-beetles.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/prevent-caterpillars.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/homemade-aphid-control.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/kill-garden-slugs.htm