You did not confirm the inspection date last Saturday as promised. Please immediate advise (the inspection date). Besides, 1000 pcs returned goods had been picked up and back to the factory?
I'm not fully clear on what you are trying to say, but will have a go!
"You have not yet confirmed the inspection date as promised last Saturday.
Please immediately confirm, to us, the proposed inspection date.
In addition, please urgently confirm your receipt of the 1000 pcs of returned goods that had been picked up and returned to the factory."
Hope I've correctly interpreted your intent.