Day light Robery

I bought bricks. The lady in the office told me that before the prices changed, they inform the clients so that we can collect all the bricks bought with old prices or you choose to leave them there with the new prices. The bulk account contract that I signed never stated anything about price increase. I just want my money back...because tomorrow I can wake up and 1 brick is R5 without anyone informing me. It seems like they got stacks of cash they don't need more customers.....