Makro Refund

I am at my wits end with Makro Customer care and their lies. I purchased an electric heater from Makro online in April and when it was delivered i realised that it was not what I wanted. I immediately logged a request to have the heater collected by them and requested for a refund. The heater was only collected at the end of May after i had followed up with them on numerous occasions. We are on the 3rd of July today and i still have not received my refund. All i get told are lies on a weekly basis. I am so disappointed in them as i have bought so many things online from them and this was my first return. I want my money. I know for a big organisation like yourselves R2600 is change but for me it means a lot.