Hoodwinked with this 500mb free data?

To whom it may concern,

This concerns Vodacom's incorrect billing and their 500mb for 3 days free gift because of the error. I phone the call centre yesterday because my data is now 0mb. The lady informs me that use my data first before the free data is used. So today I have 0mb.

I asked to speak to a manager/supervisor and she assured me that she will phone back by the end of the day. Obviously, she did not. How is it that you offer free data, but still take my data first and think there is a benefit?

I had around 170mb before the free data was allocated. When it was allocated I thought, ok, I have 500mb to use for 3 days. So I tried to use it. Meanwhile my 170mb was used first and then free data. The data expires and now I sit with 0mb.

Is this not shady? Anybody else been hoodwinked?

regards Keegan