LIVID!!!

I dealt with Ncumisa and purchased 2 x packages of R149 each. Ncumisa told me to dial 084 140# and select opt 9. I have done this and told Ncumisa several times that this number is not working. When I type it on the keypad, it says Invalid MMI Code. When I received my phones and inserted the sim cards, it read that it is the R149 package. I assumed that Ncumisa has sorted this out for me, as I have advised the number is not working. Today, I got a bill from Cell C, advising that the one number alone is over R250. I contacted Ncumisa and she said that I was not supposed to type in 084 140 #, but should've dialled 084 140 and listened to the voice prompts. This was NEVER mentioned to me. Ncumisa said she is sorry, but she assumed that I would know. How was I supposed to know, if I was told to enter # at the end of the number? The reason why I selected the R149 package, is because that is all I can afford - I do not have the funds to pay for the excess, due to the error of your call centre. I am beyond livid!!!!