STILL BILLING ME!

Yet again!!! Cell phone number ***. This account was paid IN FULL in January already! It's nearly a year later and they still billing me! They credited my account for R2500 and said they will close it. A month later - they continued to Bill me. They said they will credit it again! Surprise surprise!! They are STILL BILLING ME!!! Credit My account for the last time and STOP BILLING ME!! I come from the Cell phone industry, closing an account is a matter of clicking!! Can someone (who actually knows what they doing) seriously sort this dam account out! It's nearly a year later! Every single month it's the same ****! Is autopage not sick of me yet!! Cause I'm seriously sick of them!!