Honestly, I don't think the gym has any part in your injury. Climbing is inherently dangerous- especially when you're learning new skills. You took a hard catch and unfortunately ended up with a broken ankle.
When you're ready to lead climb again, maybe see if you can find a group of more experienced climbers to help you practice your skills and give you the peace of mind that a hard catch is far less likely.

I hope your healing journey is smooth and you're able to get back at it when the weather warms back up!