Klondike Cherry Farm Rip Off

We visited the farm today 17th Dec and had a fun time picking cherries. However the day was very much ruined by the attitude of staff when we paid. We bought about R800 of cherries that we picked and my partner saw boxes of first grade cherries and decided to add this to our purchase as well as a box of standard grade. Total was about R1400... When my partner saw the standard grade she decided to Change the box for first grade which they firstly refused but then said ok but no refund (the difference was R30) so we asked to just give us cool drink or water and they refused to return the money or other goods. Terrible service from something which is a major tourist attraction. Mind boggling that in this day and age a business still wants to rip the customer off.