Shocking service from Woolworths Credit Card

I made a payment on the 25th of July with the incorrect reference. I then emailed Woolworths Credit Card missing Payments with the correct details on the 13th of August. 5 e-mails, 10 phone calls later I still have not had any contact from anyone to resolve this. Instead i receive multiple collections phone calls & sms's every day threatening to ruin my credit record. Serious fail from a company that sells itself on its amazing Customer Service