Extremely poor service

We have been struggling with an HP M651 printer for almost 3 months now and still our printer is not fixed. Management is completely absent and provide no assistance. After at least three attempts and three times paying for services and parts, there is just no commitment or any satisfactory response to have the printer repaired. In more than 4 weeks of waiting since the last payment for replacement parts, this company cannot even provide an ETA for the parts. There response is just that they will follow up and confirm an ETA and then nothing further. HP should seriously consider an alternative service provider.