Makro empty promises to exchange faulty goods

I am disappointed in Makro's customer care services. Bought my kids bicycles to enjoy over the holidays, as we won't be going away, so to keep them entertained now that school is out . Bought it via online on black Friday, only to have it delivered missing parts and being defective. Logged an exchange shortly after which has been received and promised to be responded to from the 1st of December. Still awaiting.... keep getting emails to say someone will be in touch with me to no avail. Have tried calling the customer care 3 days now,only to hold on for over 10 mins with no answer. Finally got through today and the representative insists the initial person who responded will be requested to give me a call to resolve instead of rather logging a collection date for the exchange. Frustrated with kids bored out of their brains and broken promises for nearly a month now and no way forward with makro. Seriously disappointed