Mid size SUV not available at pick up and to pay more if I need a SUV

I was told at the pick up that a mid size SUV was not available and was offered a station wagon instead. Or I can top up to get a VW Tiguan. Staff then offered me a steep discount so that I can get the SUV due to me knee problem in getting in and out of sedans. As I have booked way in advance and for a decent period of 14 days, the mid size SUV should have been catered

I diligently checked the pricing 3 times and have to rebook my car to get the reduce pricing. In other words, the price watch mechanism did not worked I chatted with an Easyrentcars rep and was told that this mechanism needed time to adjust which I find puzzling cos there were times when the reduced pricing have been posted for a couple of days and yet I was not informed