Lack of Customer Services

I went to the Vodacom 4U Kolonade on the 27 of April 2017 to take in my Vodafone Mobile Wi-Fi R206-Z Portable Router as the Wi-Fi router was not working, they told me that it would take about 4 to 6 weeks to repair/replace depends on what the issue is. It has now been more than 4 months & I have still not heard from them in regards with this repair/replacement. I have tried to phone them & there has been no answer. I need clarification on this as I have the booking confirmation of the router which proves the incompetence of Vodacom Kolonade / Vodacom Services. This is ridiculous for that I am paying for something I cannot use. Yet they will try & sell me some new **** but cannot supply the correct services of current device. NEED ANSWERS ASAP