You will not be able to get in touch with Aldi. Aldi's whole point is they save money by not having all the frills that other stores have. I've tried, believe me!!! I love Aldi. IF WHEAT is not listed, it does not have wheat. I do know they follow UK Codex requirements for allergen reporting - of course, I don't know what that means.
I have not tried the meatballs since going gluten free simply because meatballs are usually made with bread crumbs. I know they're in Batavia IL...but was not able to get a handle on anyone.
I know they have gluten free recipes in their menu planner section - maybe you could look at those and see if there are any of them that use the meatballs? Just an idea.