Inconsistent service - Fails prices

I found a basin and wall mount unit with a price inside of R1299.00 (clearance sale) original price was R1999.00 I requested it and the sales person said he’ll check the stock for me. Unfortunately there was nothing in stock, so they want to offer the display item which I requested a discount due to its condition. They agreed next moment the price is R1899, all of a sudden I can’t get discount due to conditions because they had to give it to me with the price we found in the basin. Why are there’s prices been fluctuated every time I raise a point regarding the units condition, Tile Africa management you so unprofessional