FNB Connect I got the wrong info and deal

+- Aug / Sept 2015 I got a tablet from fnb connect. I wanted the samsung 7\ for R169 but it was out of stock and then they give me a Dell 7"tab for R134 a month which was fine. But when I got my bill at the end of the month of October it was R1339 and that money went out of my bank account. I did phone fnb connect to find out why so much money was debit from my account. And they said it was out of bundle data charges. How it be because the was R134 a month for 500mb top up. Meaning after the 500mb was up I can load my own data which I did 2.5 gig. And the money went of my account. After speaking to 4 people I spoke to a supervisor or a manager. I was on the phone for 2 hours from the fnb brach in the garden route mall. Which said that he will get bak to me in 10 working days but nothing happend. I want my R 1339 back and I want the deal that I understand I was getting. """