False marketing gimmick

I have had a data contract with Cell C for the past 3 years paying R199 p/m, on 28/6/15 I was offered an upgrade.The consultant said they had a promotion for the Hauwei Wi fi router along with the giganite product, so I upgraded to that contract provided it was the same as the one that I had.The guy agreed that the only thing that was going to change was the extra amount for the Wi fi router which will take the new monthly subscription fee to R250.00.<br> On 28/6/15 I received a call telling me I owed R900 for data usage. I asked how did that happen because I have had the same giganite product minus the router and was never charged this much! I was informed that they will suspend the services on my sim card and they will investigate & I will be contacted at the end of June but I could follow up on 10 June. On the 11 June I called the customer care & didn't get any help other than the person who signed me up on the new contract didn't give me the whole information about the contract details & I would now have to pay R1230 and they will unblock the services. On 15/6/15 an amount of R1424.20 was deducted from my account. Can someone sourt this mess out ASAP.