As my wife would say, if they havent paid you then you have already lost them..
That stems from a lein I have on a former customer, almost 20k after lawyers and court costs, and they did not even show up in court or respond to the summons, they had no intention of paying. And that was the 3rd season, they paid the first two and then played games in the 3rd.
We have a house that we are going to tomorrow, either have money in hand or I walk with my timers and cords so they cant plug in for christmas eve.
Do whatever you need to in order to get paid in the next 48 hours. Christmas lights lose a little bit of value on the 26th