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Hi Paul, thanks for your question.
It sounds like a firmware update has made the software on the cartridges go out of date. Sometimes installing a new cartridge triggers the printer to check. If you purchased them from us, we may be able to replace them for you. If you just want to buy new ones, the CLT-504 cartridges are the correct ones. You can find the compatible pack here: https://www.tonergiant.co.uk/product/Compatible-Samsung-CLT504-B-C-M-Y-Toner-Value-Pack-RECLT504SPACK-95500/
or the original Samsung pack here: https://www.tonergiant.co.uk/product/Samsung-CLT-P504C-Toner-Cartridge-Multipack-B-C-M-Y-CLT-P504C-95963/.
If you need any more help or wish to raise a return/replacement please let me know.