Missing item

I placed an order for a few items on a Sunday, and recieved them on a Tuesday as expected. One of the items, (a very physically small item but very important) was forgotten and I noticed it and called Customer service sameday. I was assisted by an agent named Lutholwetu N. The agent said they would escalate the issue. All this happened on Tuesday, and its Friday 5pm and only NOW do I have a new order number. I've had to wait three WHOLE business days just get confirmation for when my missing product will be sent. ONTOP of that the order information says my missing product is only coming NEXT WEEK TUESDAY. I needed this product urgently for health reasons & all these agents have is their pathetic apologies. This agent didn't keep me updated unless I asked !constantly!. They've been extremely ***********. This is pathetic!!!