It seems its not just Nxstage here in Aus , I live in the country 5 hours away from my suppliers and we have the same problems , every month there is some sort of drama the worst was last month when we ordered but someone thought we had enough left and wouldn't need any but they didn't realize that we do 8 hours every second day and go through more than the average after lots of phone calls an emergency order was done and it arrived the day before it was needed , to close for me . We are learning to keep a back up supply that they don't know about. Hope you get a good result with your letter