Mac Cosmetics Hyper Real Serumizer Finishes Quickly

I bought the Hyper Real Serumizer from the Mac Cosmetics store and I was really happy with how well it worked when I tried it out. It's been about two months, and I don't wear makeup every day. Also, I have a bunch of different makeup primers. I've used it a maximum of 10 times, giving three pumps each time. I can't believe it, but the product is already done. It feels so surreal. The package doesn't say how much is inside, but I think I got way less than expected. There's no way a product should be empty after only 10 uses. I was so unhappy with this shopping experience, I'll never do it again.