Limit on account

We have a contract with Cell C whereby a limit of R50.00 was placed for a contract - this was confirmed at the branch with the consultant. they failed to load same and this resulted in a data charge of R2000.00 for the month. this is absolutely ridiculous as a client, I expect that my simple instructions were followed so that some thing like this does not happen. I am unable to afford that payment and I refuse to pay for something that should not have happened in the first place. How are people to live when ************ companies take advantage of people who are ********. The account is on my partners name but it affects our family. We have no money to buy food because Cell C and by extension their staff, did not follow through with a simple instruction. Now my family has to go to bed hungry because of their mistake. I need someone to take ownership of this query and get back to me today. Why should my family suffer because of someone else's incompetence.