Price difference on online purchase

Good day, I'm already tired of struggling with Macro. I bought a Gas stove online, received the wrong one. I said I would keep the wrong one, but there is now a price difference that they refuse to give credit. I believe I have to recover it from distributors etc, but I paid Makro for the purchase of StovePlease macro does not come back did ask me for a photo of the price difference and that was it. People if anyone can help me to solve the matter. Please contact me because I have been struggling with Makro for 2 months now. This is extremely weak from such a large Firm