A couple of months ago I closed my account with Shaw when I moved across the country. I signed up for email notifications about bills, but never received an email notifying me there was an outstanding balance on my account. Today, I received a phone call from a collections agency notifying me that the debt has already been sent into Equifax and will be a blackmark on my credit score. I called Shaw to figure out why they never notified me (via email OR phone) that there was an outstanding balance before sending it to a collections agency. I have two questions:

1) Can you please explain to me why I was never notified of this bill? 

2) I've now paid the collections agency, but I would like Shaw to do something to fix the issue on my credit history. Please advise.