Gross over charge on medication

Over charged on medication. I went to Witfield pharmacy. I was charged R604. But googled cost R451. I called the pharmacy and was advised that discovery set the prices. Discovery confirmed that the pharmacy sets the prices. Called the pharmacy back. Joan the pharmacist advised me that discovery sets the prices. She gave me the owner's number. Called him. He was very rude and defensive. He blamed the petrol price and that the prices were standard. He put the phone down on me. While can deal with this. Linctigon immune booster shelf price R95 was charged R187 on medical aid.