I replaced my ink cartridges on dell 922 all in one printer and still get ink level low error.?

I got the same problem in my printer all in one 924. Even more before printing something i have to try it on another piece of paper or shake my printer. In store where i bough the ink they told me dont pay any attention its happen almost everytime if you buying ink not from dell company or something like this. So just do the same dont pay attention!!! That mean this ink is just somethimg really bad. Fake. Bad production. whatever.