Vodafon 3G power tablet purchased - no data access

On March the 4th, I purchased a Vodacom 3G power tab from Makro - Ottery, Cape Town. I was also given a promotional sim card with the tablet, and I was told that I would get 250MB of data for 24 months free - cell number for the sim card is - ***. The problem is that - it is now more than a week later and I still don't have data connectivity on this device despite calling the customer care line and confirming that the APN settings are correct, data connectivity is turned on - I even loaded R20 to purchase a 250MB bundle which was a loss - as I still got no connectivity. One would have thought the APN settings would allow connectivity even from a prepaid perspective - but unfortunately not. Right now I am been given the run-around as I called Makro's head office to complain - and then the Ottery store called me and asked if I could bring the device to them as it was just a settings issue which they would rectify. Unfortunately that was not the case when I went to Makro, as I got some explanation from the sales lady - that it is some \Firewall\" issue between Makro and Vodacom resulting in my device failing to get data connectivity."