Drinks color ink printing black/white faxes

You will spend a lot buying new color ink tanks (3 separate colors) even if you only use it for black/white faxing. I have owned this machine for 3 months and received ONLY black/white faxes, yet I am on my third set of each of the yellow, cyan, and magenta cartridges, about as many as black cartridges. The machine will NOT do ANYTHING without each of the 4 cartridges being full. Brother support has told me they will send me 2 sets of color cartridges, but that is all they will do. The inability of the machine to function in black and white without all three color cartridges being full is a serious design flaw. The company tells me it is not supposed to use as much color ink as I am experiencing, but does use some on even black/white faxes.