Bridge of contract

I have requested an additional line on my contract in order to receive a New cellphone<br> My Specific package signed should be at a cost of R 249 per month <br> <br> After receiving my device I was informed that my sim will be active in two days. I have called into the store more than 5 to 6 occasions two weeks later still not active! my concern was mainly that I had a device that was not debited or active!<br> <br> Today the store contacted me regarding only to inform me that my contract is actually an amount of 319 and not 249 which i have signed and will be activated today<br> <br> The only resolve from their side is that they will have the sales assistant who helped me personally deposit the difference in my account on her expense. What guarantee do I have of this happening?? is this the solution from VODACOM's side? Is this not ********* ?? how does a fault from your side become my problem? I have even insisted I return this device. Instead was told its tool late for this. <br> <br> I was informed that my first payment of 319 will be done in 48 hours, if so in accordance to my signed contract this is not the agreed upon amount of 249. leaving this transaction to be an ******* one from your side