Very disappointed and upset

I'm extremely disappointed I took my sister 55 yrs old to specsavers Clearwater she done her glasses in September but I only managed to pay to get it now in May but she also found out now she has diabetes.She look through the specs and could not see a thing. She has been wearing it for three days to see if it's just her eyes.the lady we collected it from said we must bring it back they will adjust it for free.This morning she goes to the optometrist he says no she must were it like that and come back in Sept so he can redo the whole test again.what a waist of my money that I didn't have in hhe first place.Can someone tell me is there no why we can rectify the lense because she can not see anything .