Muscle Spasm Above Brows After Botox Treatment?

I had 12 injections of botox a nonth and a half ago - 8 days after I experienced the mad raised brow look - went back after 4 weeks as this hadn't subsided and had a very small amount of botox where the brows were peaking and another injection in the centre between brows. I had experienced brow drop and the raised arches were not a good look! Its now 2 weeks after and I am having muscle spasms in the one muscle over my left brow - making the area where my frown lines were apprear puckered. help