The U.S. Supreme Court, in the case of Fuentes V Shevin 1407 U.S. 67 (1972), held that the defendant in any lawsuit must be given notice of the suit and an opportunity to be heard in court. Louisiana's current executory process procedures barely comply with these requirements....
That being said, YES, you should have been served with a demand for payments that are due and unpaid on the loan. You should have been given 3 days to come up with the money.
Prior to that, however, you should have received "late" notices from the mortgage company when you got behind in your mortgage.
It is your obligation, however, to keep in contact with the company that you are working with for a loan modification.
You need to go to the court IMMEDIATELY to get a copy of any papers filed. You also need to contact the mortgage company IMMEDIATELY if there has been any mixup.
Don't rely on the mortgage companies to help you. You need to get the paperwork and you should take it to an attorney who specializes in property law. Sometimes an initial consultation is free or at a minimal charge. You can discuss the facts of your case, evaluate your options and decide what to do next.