complain regarding closing this account

i have payed up my account on 18 august but your accounts reflect that i owe them R390 on main account and R16 on mobiMoney,i called them to close that account, they have set they didn't receive the proof of payment even though I was owing them 64K ,I payed up R68k but now they giving me excuses when I demand them to close those account and provide me with proof that the accounts is closed, they are unprofessional and they do this intentional just to **** us those R100 for no reason. I have sent them emails, they are so unprofessional that's why I decided to close those account...please close my account and stop being giving us duck 7dive when we have payed up. I also decided to cancel funeral cover because you have hired unprofessional people who don't even understand how your system works.