Product not delivered and no reason given

I purchased a product online and was awaiting my delivery as the delivery status had changed to "handed to courier"

On receiving an email, I called the Makro call center to enquire as to the reason why the product was returned to the store. The consultant could not provide a reason. I am really dissatisfied by the lack of communication received. This was a gift for a family member so I am sure you can understand my frustration.

Email addresses provided on their website, returns a postmaster-undelivered.

Why should I continue to use Makro Online going forward?