No feedback on credit card increase

Hi I've called in for a credit card increase on 30 September 2015 and sent the requested documentation . <br> I was told it takes 3 working days it's been 3 weeks now and no response. I've spent more than R200 worth of airtime calling the call centre and they say that they can't help me I must wait for sms. I find this really unacceptable. If this is not sorted out by Wednesday I will be changing banks.