Telkom refuse to refund customers on time

I received a call from *** about my complaint that Telkom debited my account for the wrong amount. The lady I spoke to told me that she cannot process the refund because it is not yet reflecting on their system. She said that once it appears on their system, then only can she process the refund which will take between 5 and 10 working days. I told her that I need the money put back into my account immediately or I will be forced to reverse the payment. She told me that she WILL NOT do the refund because its not on her system. I then got an sms on my cell phone from Telkom SA saying \Your case 1*** has been resolved. Who you gonna call!\" This case is not resolved, Telkom refuse to refund me money that belongs to me and have a bullying/intimidating attitude with their customers. Telkom are putting their customers in very compromising positions. I need this money refunded ASAP so that I can honour my other financial commitments. With this attitude, Telkom are basically putting me in a corner."