Makro Robbing Customers

Purchased a verimark bauer set from Makro and paid R899.00 for the set 3 months later the lid was faulty and I took it to Makro to return it, they booked it in for assessment I received a call saying that they will credit me however if I want to take another set I must pay an extra R100 as the price is gone up. Its not about the money but about the principle, why should I have to pay a higher price? Its the same product why can I not get it for the price I paid? What about the inconvenience on my side Just another way for them to make money of us