This is a fundamental misunderstanding about how collections work. To get SOME money, Crapria will SELL your debt to a collection agency for a steep discount. Now it's the collections agency, and not Crapria that owns the debt. Crapria is no longer involved. Collections agencies are relentless and won't stop unless you TELL them to. You do have rights but they vary by state. Most states have either a website or brochure you can look up your rights to not be annoyed by the Credit agency.Taking you to court is not an option for them. Simply put, doing so would cost them thousands upon thousands.
Their next step is to send the account to collections. Upon hearing from collections, inform them you dispute the charges, don't owe them anything, Apria needs to take your to court and to stop calling you.
But it may hurt your credit rating, and make it difficult for you to get credit, buy a car or a home for up to 7 years--a long time.
I'm wondering if maybe YOU have an action against Crapria for fraud. You might if you can prove they said one thing and did another. You can take them to small claims court, and get damages if you win, but it may be difficult to collect.
As for your headline, "Lied to by DME (Apria)" It's not news when dog bites man, only when man bites dog. There's a reason we call them Crapria.