Sunbeam 14ltr mineral water pot doesn't work

I purchased a 14ltr water filter pot at Makro. I followed all instructions of soaking and rinsing the filters an assembled the unit (pretty straightforward). Filled it up in the eve and went to bed. In the morning, the bottom vessel contained little water, yet the top was empty. The kitchen floor was wet. The water did not go through the second 5-stage filter and overflowed instead between the top and bottom water tank. Such a simple product, yet it doesn't work. Now I have to drive back to Makro, fill in papers etc to get a credit. I did the diligent action of phoning Nu world industries to report the problem with their product. What is absolutely shocking is that the lady in customer complaints was not even remotely interested in my feedback.