BAD BAD BAD Struggle to close the account after the balance was paid in full

Good day Can you please assist with this matter ASAP We have settled my RCS account on 17 August 2019 for the amount of R5831.51.I have send Emails to settle the account and close it,I have made murmurous phone calls witch cost me money. On the 5th of September you have debit my account again for a installment almost 3 weeks after I have settled the account and two weeks after i have send the proof of payment. Last nite I phoned and when I reached a consultant they couldn't help me and put me on the line for 1 Hour and nothing happend.DO YOU KNOW HOW MUCH AIRTIME IS 60 MINUTES SO I WANT MY ACCOUNT CLOSED AND MY MONEY THAT YOU TOOK. REFUND ME ASAP I REQUEST A PAID UP LETTER PLEASE!!!!!!! What more do I need to do Thank you