Digital BW, The Print

Have any of you used Mediastreet funnel fill cartridges in a 4000?  I 
installed a set on my printer last Thursday and could not get the 
printer to recognize all the carts at the same time.  I contacted tech 
support (through email, the only way to contact them) and spent about 8 
hours Friday trying to get these to work.  The best I ever got was 7 
carts recognized although the matte black one never was.  It either 
said "Set Ink Cartridge" or occasionally it would see it but say it was 
empty.  Resetting the chip didn't help.  I have wiggled every cart up 
and down, left and right, raised and lowered the levers, turned the 
printer on and off, unplugged it, cleaned the chips with alcohol (per 
their instructions) etc.  Mediastreet maintains there's nothing wrong 
with the carts and refused to give me an RMA# to return them for a 
refund.  They did send me a new matte black cart which I received today 
however it didn't solve the problem.  If I remove the Mediastreet carts 
and reinstall my piezo carts, the printer works perfectly.  Any 
suggestions on how to proceed?

Thanks,
Jenny Ellerbe