Poor Customer Service - No Resolution of Overdue Delivery

I have placed an online order with Makro on 28 July. The order had 3 parts as it came from 3 different stores. Two of packages were delivered on 01 August, but I am still waiting for the delivery of the third package. The Makro system shows that the queried package has been delivered and that the one that has been delivered is still outstanding. My online profile shows that both these packages have a status of "Packed". I have been in contact with Makro since 03 August via telephone and e-mail and all they state is that they are investigating and will provide feedback, which they never do. It just seems like there is no will to resolve this matter. I am at my wits end with Makro and do not know how to resolve this issue. This is an example of how not do treat your customers, especially one that is super loyal and buys from them frequently. I would appreciate it if someone from Makro can contact me to resolve this issue as a matter of urgently.