Update: The phone number for Canada is 1-800-939-3769
Validate correct cartridge is inserted per billing plan. If correct try a second cartridge. If this does not correct the situation, please call respective hotline we need to collect data. We will send you a new MSOK and PEK
US 800-821-2797
Canada 1-800-432-9779
Can you help me out please i have a workcentre 3550 i bought the tonner from you but when i put it send me the error invalid print cartrigde
