I've found several discussions about the general use of "collection" vs "collections" but not in the context of debt collection, specifically.
I'm currently editing a series of documents that describe debt collection software (fun!) and the document is rather inconsistent in its use of "collection" vs "collections" across a variety of contexts, but especially when "collection(s)" is used to describe a noun. For example, "collection(s)' software," "collection(s) officer," but also "collection(s) and recovery."
Is this a situation where both uses are correct, but it's more important to be consistent? I often hear people say and write both "the bill went to collections" and "the bill went to collection."
For context, this is for a U.S. audience, so I'm seeking to understand the preferred or standard usage in U.S. English.