Strange Hollow Dents Between Eyes After Botox

I could see the difference on my forehead however; I had two strange hollow indents between my eyes when I would raise my eyebrows that REALLY stand out especially because now nothing else on my forehead moves. I went back after 2 weeks and was injected with a small amount of Botox above my eyebrows to try and correct the problem. It has now been 3 weeks and the problem has not resolved. My face now bothers me more than it did before have you ever head of anything like this happening and what should I do?