Unfair charging exorbitant profits

I went to PG optics(Bracken city) in November 2015 to get a new pair of prescription glasses. They quoted R3 900 after a 20 percent discount, I was told just my lenses cost R2 700! Out of ignorance I accepted to have my glasses made by them. <br> After speaking to some colleagues at work the following day I got the impression I was being **********, so I went to another optometrist and I got a new pair of glasses for R730 including eye test, lenses and frame!!<br> I was shocked at how greedy and unfair PG optics is at their pricing, and so I phoned them and told them I can't take their deal anymore. The optometrist called Hannes threatened me with being handed over to the debt collectors and being blacklisted if I did not collect the exorbitantly charged pair of glasses. Appalling!