This is not an uncommon side effect of Botox treatment for forehead lines. A proper pre-treatment evaluation can often determine if this is likely to occur. True eyelid ptosis is very uncommon, and doesn't sound like it occurred in your case. As for a refund, no medical treatment is absolute and since this is a known side effect, I wouldn't ask for a refund. If you trust your doctor, go back and the next time treatment can be modified to reduce the chance of it occurring in the future. Sometimes patients have very deep forehead lines from low brows or overhanging eyelids, Botox should not be used at all in these patients. They need surgery. So, for next time, either discuss this with your doctor or make sure you go to a specialist with a lot of experience with Botox, such as a Facial Plastic Surgeon, Plastic Surgeon, Oculoplastic or Dermatologic Surgeon. The good thing about Botox is that if the results aren't ideal it goes away , so wait for the makeup. The bad thing is that most patients like the results and it still goes away.