Worst experience getting Spectacles ever

I booked an eye test at the Menlyn branch on the 14th of January 2018. My order was placed and my Medical has already paid for my spectacles. I called the branch last week (24/01/2018) and was informed that my spectacles will be delivered to the branch on the 25th... I drove all the way from Bronkhorstspruit on the 27th only to be informed that my spectacles will only be delivered on the 28th, but that they will call me when it is ready. I then asked if I can just cancel the order and was informed that I can not cancel since the order has already been placed. Today is the 30th and I still have not heard anything from them, I am not calling them again since I am only going to be told that it will be delivered tomorrow... It is totally unacceptable that it takes you more than 16 days to get spectacles made. So since I can not cancel my order, should I just go without spectacles until they eventually deliver it to the branch? Previously I used Spectacle Warehouse and within 3 days my spectacles where ready. This is the first time I have used Specsavers and it will definitely be the last time.