Over debit of account , no refund ??

My monthly account was debited on the 26 June 2015 by nudebit? , by the amount of R1148.30. <br> According to the Telkom mobile agents my due amount was R599.00. I've requested that the remaining amount be payed back to me. I've dealt with the various call centre agents since that date and was advised to call back by the 3 July 2015 when their new billing month kicks in and allow time for the system to sort out the payment issues. I've done as requested, spoke to another agent, this person advised me to wait 70 hours for a response, I was not called back, and took it upon myself to call on the 10 July 2015 again, i have been told to wait yet again until someone gets back to me? I have been a loyal customer and even recommended friends and family to join up with this service provider. I am seriously considering going to another network provider, because every month there is some issue when it comes to my account, last month i was suspended. Your feedback on this matter will be highly appreciated. Case number for this call is ***0