LVNV Funding is likely a collection agency that bought the delinquent account so, yes, now you owe LVNV Funding.

The statute of limitations for a lawsuit is 6 years in AZ so they are well within the time limit to sue.

The first thing (very important) that I urge you to do is go to the courthouse where the lawsuit was filed and get a copy of the complete case file, every piece of paper in it, so you know what's going on.

There should be a court name and address and case number on your papers that you received.

Then come back to this thread and discuss.