HP 304 printer ink (Norwich and Surrounding Area)

Hi, I have HP 304 ink cartridges, but they are from Cartridge People and won't work on my printer. They are new and unused. The warning from Cartridge people states, "Note: If you have signed up to HP+, our own brand cartridges will not function with your printer. This is due to HP+ preventing the use of third-party cartridges.

Fair Chance Policy: I’ll wait before choosing a recipient to give more people a chance to reply.