Poor treatment at Spec Savers Mall of the South

I broke my glasses when I walked into a door during loadshedding. When I went to Spec-Savers at Mall of the South I received little sympathy when I explained how disoriented I felt being unable to see properly. They gave me a trial pair of contact lenses to use in the mean time but they were the wrong prescription. I had a difficult day today struggling with blurred vision and irritated eyes. After paying upfront because they refused to process my prescription without full payment I received an email that my glasses will only be ready by 18 June 2019 despite me explaining how urgently I needed my glasses. I am a teacher, we are in the middle of exams. I can't do my job of invigilating exams and marking scripts without my glasses. I explained all this to Spec-Savers at Mall of the South but received no sympathy. I didn't ask for a hand out, I've paid upfront. Surely it's not too much to ask for my prescription to be treated with urgency because I don't have a spare pair of glasses.