S.A Landy. Trying to get rich quick

A couple of weeks ago i bought a concentric clutch slave cylinder for a 2003 Land Rover Freelander TD4. Paid R1800. That same day i priced a Clutch Master Cylinder for the same vehicle, they quoted me R450 including vat for a 2nd hand unit. Today i phoned them & they charging R700 excl vat. I asked them what make it was, he was unsure as its was somewhere in their storage yard. When i told him they quoted me R450 last week, he said that the unit in question was in slightly in better condition than the one of a week ago. Now he never knew what make it was how on earth could he have known its slightly newer. They have done this numerous times before.