STILL BILLING ME!

I am still having problems with this contract! My account was settled in January already! But autopage is still billing me????? Cell phone number ***. I paid this account in full, yet they kept billing me. They then credited me with an amount of R2500 and told me it will be sorted and closed! Imagine my surprise! They still didn't close that account! They are STILL BILLING ME!!!! Seriously???? How long am I going to have to deal with this??? It's like I have all the time in the world to go into store and sort this out. Can someone please do their job and close this dam account. I mean seriously man - it's been nearly a year now! Please credit my account and sort this out.