Client deescalation needed and intervention by company leader...

Client refuses to test - too much work they say.
Client wants a lot of changes - but cannot define what.
But most frustrating... Even as we tried to with all patience that was left to find out what they were doing aka how they work, what work flows, documents and so on were involved, they basically started a team discussion and seemed to work all differently...

And the project should be a complete sale and warehouse solution, suited and written for their needs.

Really? How can a company like this work?

It's not the first time I've dealt with hard projects or 'weird' customers, but really the first time I have no fucking clue what I should do.

Can someone please summon Ctulhu?

Sounds a lot like my first job , I had to make a bar-code system to integrate their live production with their erp and all that , first month : I settle in , get to know people , start staring at workflows . Second month : look at paper workflows , look at real , in-the-field workflows , realise they are completely different , implement prototype , ask people to tweak their workflows accordingly . Month 3 , prototype works as long as people in production do what I asked them to , most of them don't . End of month 3 : out of space big boss's daughter comes in asking to see project results , I show her how it works , explain why it has missing data (production not adapting to doing TWO MORE CLICKS ON THE SCREEN) , field test and prove her it's working . Finally , blames me for not covering the workflows properly . I resigned . I wiped clean all working copies of the app and the one I left is an open highway for their vpn , which I can still access without that...All for 250 euros/month

Second Part : The workflow for production was something like this : get by eye-measuring the amount of junkyard copper needed , smelt and correct the process until the right combo is reached , input : 1-10 (mostly unknown , even though weighted) tons of junkyard copper , output : 'depends' number of copper alloy bars . They decided to go back to writing all that info in notebooks and loose sheets of paper again after I left , the workers complaining that they were working extra for those two clicks.

Two words: RUN AWAY!