being charged extra for inclusive data

From my end it started like this.<br> I recently upgraded to cell c giga 20 deal. That is 5g daytime and 15 gig midnight.<br> I got softlocked, meaning that I used up all my data plus the default credit limit(R2000). i was surprised.<br> Up till my first call to cell c customer care I was convinced that I upgraded to a deal that gave 10G daytime and 10 gig midnight data. I'm still waiting for the recorded call of when I did the sale to assure myself that this is what I signed up for.<br> I had a look at my billing invoices since I've upgraded, and I noticed that I'm being overcharged. Disputes raised:<br> #***(for may 2015) & #***(for June 2015 invoice). First despute was raised 2015-07-02 and I was promised attention after 2 working days. NO human response yet. June's Invoice is ?R2000 more than my subscription fee. <br> I'm stopping the debit order on my side until this is resolved and I am refunded what I was overcharged with.<br>