User Activity

So, I have used Canon printers for more than 15 years...but Canon refuses to answer customer queries?True. I am merely one of millions of Canon's customers and in the long run it is clear that my issues with my three canon printers are not important ...
I have a TR 7020. I received cartridges with it. As soon as I installed the black cartridged it registered as low and within two week - of printing VERY little it is not empty....WHY?