Refuses to pay for my claim

So I've joined Discovery last year and my cover started on the 01 Jan 2017. In March I went for a eye test as something didn't feel right, my eyes were so dry and itchy , so I've decided to have it check out. The optometrist gave me the feedback of my eye test and said I need spectacles as I work in front of a pc everyday and it puts alot of strain on my eyes. So we started browsing through the spectacles and I got everything. So I had to pay, gave my Medical Aid card and Discovery blatantly refused to pay for my spectacles as my savings wasn't enough. I didn't know I needed specs but if I knew that , I would've never joined Discovery. Can't wait to change to a new Medical Plan next year.