Don't worry! I'm convinced, that all chinchillas learn, how to use their toys, just take them time.
But later, they decide, will they play here, or not.
Not all my chins are really into running wheels. Majority of them like it, but I have a group of young males(of course, they are not staying together, they are separated
), that are not fond of it.
So, plastic one wasn't a good idea, sorry. But, in spite of everything, they should just try it! Chins are very inquisitive.
Your position - "keep calm and be patient".
Take your chins time.