Day light robery

We went and bought wipers at ford Gezina in pta yesterday went back as the wipers were not the right ones gave them the vin number and gave us the correct onse asked the man what is the price difference he said no more or less the same did not do a credit note and book out different stock just gave it to me I then called ford boksburg for a price on the wipers they asked us R170 +- for both wipers for our bakkie we paid almost R400 in pta I called the manager and his answer was some ford sell **** parts