Need a repair. Can't get anyone to help me

[Ndiffee]

We have an HP Latex 800 W. This morning I got an error. Either the white ink pressure sensor is bad or the white ink cartridge is defective. I have ordered another ink cartridge, but it won't be here until tomorrow (and I don't think that's the issue anyway) . In the meantime I am trying to get in touch with someone to schedule a repair if necessary. I have been trying for about 3 hours. The first 4 times I called, I waited on hold until eventually the call just disconnected. When I finally did talk to someone they told me my serial number was not registered (even though I know it is) and said they would email me a registration form. I waited and waited. Never got the email. Called back again, same thing. They said they would email me a form, but I have not gotten an email. 

Our company has purchased two HP Latex 800 W printers and we spend tens of thousands of dollars on supplies per year. The fact that we can't get any help when we have a problem is extremely frustrating.

Does anyone have any tips on how to get through to someone who can help? 

If so THANK YOU in advance!

[Repairatrooper]

Were these purchased directly from HP or through a vendor? My first contact point would always be vendor as they tend to be more responsive and can also escalate the issue easier than an end user.

[Ndiffee]

Thanks for the response. I bought it through a vendor, and they were my first call. They haven't had any luck either. I also tracked down the number of a service tech that helped us out several months ago. He said he would try to help, but he has the same 1-800 number that I have.