Apple sells me a MacBook to deliver $1700; cancels 5 days later quoting $2000?

I got the basic Macbook Pro for $1700 pre tax. They changed the prices after I had already signed (through Apple Business). Before sending me the purchase order, they cancelled my quote, sent me a new PO at the higher price, and the Apple Business Rep had to argue with them to undo this. I ended up just paying in full rather than going with the lease. But isn't this super lame for a company like Apple and even illegal?