Poor Service

I received an email from woolworths that my account was in arrears ,I then made a payment using the same details that were sent to me via email . A day later I received an sms that my account has been handed over to the collections department , I then called the customer service for assistance I got to an agent that was not paying attention to what I was saying to him

I had to be the one asking him what is it that I need to do to get to the bottom of the issue . He then provided me with an email address to send my proof of payment . I sent two emails to these addresses ********** and ********** till date I have not received any feedback and my account is still in arrears , The next thing I know I will be charged interest for a late payment . Should I receive a statement with a charge for a late payment I will take this further .