Is this sentence correct?

[Zoe2008]

After seriously negotated with the customer, they are unwilling to accpeted the goods by latest 20 May. Please keep any eyes on the schedule, no further delay will be accepted.

 

[emsr2d2]

After [STRIKE]seriously[/STRIKE] lengthy/much [STRIKE]negotated[/STRIKE] negotiation with the customer, they are unwilling (I think you mean willing?) to [STRIKE]accpeted[/STRIKE] accept the goods by [STRIKE]latest[/STRIKE] 20 May at the latest. Please keep [STRIKE]any[/STRIKE] your eyes on the schedule - no further delay will be accepted.

I'm a little confused. It would make more sense if the customer had now agreed (be willing not unwilling) to accept the goods by a certain date. If they are still unwilling, then what was the point of the negotiation? It makes sense if they have now decided that they will accept the goods on or before 20th May, but absolutely no later.