Seriously incorrect Edgars account

Account numberb: ********** ********** 50853 Reference nubers: ********** 642834 and ********** 642841 At the end of June my Edgar's account should have been at a credit of R5. To my dismay I received an invoice for the amount of R248. 78 for airtime, SMS and data. I have never used any of these items as I have cell phone contracts. I visited Edgars Mossel Bay the next day to sort out the problem. After spending more than two hours talking to different departments of ExxonMobil in Johannesburg I was assured that the error was corrected. The reference numbers above apply to this. On 15 August I received an invoice for R331. 55, R78. 00 was debitat for airtime /data. This morning I received a threatening e-mail demanding immediate payment. After spending a lot of time on the phone and sending e-mails I am at a loss, it seems nobody is prepared to respond and rectify this serious matter for me.

Please help me.