Can you get a refund and buy it somewhere else? It's their fault. I would kick up a stink.
If you can't, I would ask for a tempory table and wait for it. I think you will regret not getting a matching one and looking at the odd one will remind you of this..over and over again.
Another idea, I use a change pad on the floor when I'm over at my Mum's place and this works fine. It's not as nice as the change table set up but is safe for Bub or maybe you can borrow one from a friend who no longer needs theirs?
Geez, 3 months is a long to wait for furniture that you ordered another 3 months ago.
Good luck