Still no answers from Cell C

I am really frustrated with the lack of customer services from Cell C. Because of an error on their side I was charged R248.02 extra for calls that were made on a contract they signed me up for incorrectly. I spoke to 'MJ' on 2 April 2015, who said that Cell C will credit my account for R248.02 and he will ask the finance dept to sort this out. To this date, my balance does not reflect this credit. I submitted an online customer services form last week querying this, no response from a human yet, only automated emails. I contacted Blanche Opperman an Escalation Agent to assist with this as she knows my query history, still no response. I am extremely disappointed and frustrated with the lack of customer services from Cell C. Please can someone contact me so I can cancel this contract as I am tired of being overcharged because of an error on Cell C's part, with no resolution. ***