Missing a flower. Hummers don't love it but the ants do

This is a very pretty feeder, however it arrived with one the yellow flowers missing. I emailed the company hoping to get just the flower replacement but never heard back (and this over a month ago at this point). My hummingbirds don't seem to care for it though. They will use it if the others are empty, but it is not even close to being one of their favorites. Funny enough, they actually use the port where the flower is missing, so I wonder if it's the flowers they don't like about it. The fill hole is pretty small because the glass is so thick. The opening is about an inch, maybe less, making it kind a difficult to fill without spilling.

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