I reviewed your order history, and see you originally bought 9800 refillable carts and Piezography ink from us about six years ago.
I have a few questions below, if you could please answer to give me more information about your setup/situation, in order to determine what's going on, and the best solution to get you back to happily printing.
Are you using the same printer since then?
If so, how often have you cleaned the capping station, wiper blade, flushing box and bottom of the print head? Have any parts been replaced, such as the dampers, wiper, capping station, flushing box, etc?
If so, what parts and when were they replaced?
How often have you been agitating your ink carts?
How often has this printer been used vs. how long does it sit unused?
What are the temperature and humidity levels in your printing environment?
When did the mis-firing nozzles first start?
What have you done already to try cleaning/fixing the mis-firing nozzles?
Please let me know so I can help you past this and back to printing.
Best regards~ Dana