Bests & Worsts Reviews from Amazon

I purchased this in August to have on hand when I ran out of ink. I ran out of ink, installed the cartridges and the black ink is defective. The tri-color seems to be fine. Being that it is out of Amazon's return stage, I am in a quandary as to what to do. I have paid for a product that I am not able to use. Any suggestions? EDITED - I am adding to this because I took the defective cartridge to CostCo ink services (by mistake - was trying to get my old empty cartridge filled to save money) and CostCo said that my brand new ink cartridge that had never been used was only 75% full based on the expected weight and actual weight. So not only was a I sent a defective cartridge but it was not full either. I have downgraded my 2 stars to 1 star based on this new information.