Client is facing issues in customizing the bot icon for their mobile apps

Kindly assist on the below client query:

Every time the yellow team makes a change to the chat bot script, such as changing the icon size or notification view, I notice that the id and HTML structure change, and in that case, we are unable to target a unique id for customising the chat bot’s icon and notification position.
— If the yellow team can assure us that the ID will remain the same and the element won’t change, then we can change the position icon and notifications.

Client confirm does the script to deploy changes? how often does this change