Epson C66 won't print without color cartidges

I have the exact same problem with my epson RX420 printer.
When my color cartridges were running low, i went into the settings and changed it to 'print only in black and white' - a number of weeks passed and somehow the color carts came up as empty, althought i never printed anything in color.
Epson is a complete rip off.. I now have a printer with a full black ink cartridge and cant print anything until i replace the color ones (COSTING €50!!!! )which i have no use for>
My Advice to anyone =DO NOT BUY EPSON PRODUCTS/EQUIPMENT/PRINTERS.
This sort of treatment of customers/users is just evil

epson printers won't really print if one cartridge is not detected or detected as empty. the only option that i can suggest to you is that, buy a continous ink kit at any ink refilling station in your place. i highly recommend that dont leave a cartridge empty with ink cause it might clog your printhead. using a continous ink system's cartridge is auto reset, whenever the printer says that the cartridge is empty, it will automatically resets itself. ink refill kit comes with 100+ml of ink per color i think. and it is much cheaper using original epson ink.