Shocking service 2 years running from Discovery Invest

This is now the second year in a row that Discovery Invest has put the incorrect source code on my tax certificate. Yesterday, Khani at the call centre told me that it would take 10 days to fix. This is not acceptable. I can't submit my tax return until the error from Discovery is fixed. I was retrenched just over a year ago and I urgently need my tax refund. You end up having to jump hoops of fire to get anything sorted at Discovery Invest. A turn around time of 10 days on a mistake they made is simply not acceptable. All it takes is changing a code from 3915 to 3907. Ten days????