Dealer Principle Glen Rudd does not respect customers

I purchased a vehicle this week from Mahindra Pretoria North.I Swiped my card and paid for the vehicle in full using the dealers POS card machine. The transaction was approved by the POS machine yet the Dealer Principle refuses to let the vehicle be released until the money reflects in their account. Glen Rudd showed a remarkable disdain towards me as a customer and throws Mahindra Upper management under the bus by stating that it is instruction from Mahindra head office. In all my life I have never had a merchant refuse to release the goods until the money clears in the business account even though the Transaction was approved by their bank and POS machine. I am requesting for this matter to be escalated to upper management and expect a response from this dealer principle’s superior to clarify and justify these actions.