Makro not refunding, 3 months NOW

I am too frustrated with returns to Makro since 14th February. Numerous phone calls and emails, including communication with "supposedly" team leaders or managers sitting in the e-commerce division and I have attempted numerous telephonic calls to the CEO office *telephone number **** ... to no avail! Out of 6 attempted calls to the CEO's office, 5 times no-one answered *no matter what time of the day* and the one and only call that was answered was hung up. Can ANYONE suggest who to call next?