Over charged at unjani clinic Olivenhoutbosch branch

On the 20/07/2019 i went to unjani clinic in olivenhoutbosch to get a medical certificate for a pdp application ,an o arrival i asked the lady at reception how much it cost an she told me it 150,00 an its on the price list that i posted al the wall but to my suprice after feeling the form even without doing any test on me physically the lady in the consulting room told me to pay R200,00 when i asked her why she told me thats the price i needed to pay as the price on the price list is for other branches not the olivenhoutbosch branch