Account not being closed

I sent proof of payment on 5 April 2019 to confirm that my balance has been settled. I was told it take 24 to 48 hours to close the account. I queried this again on 10 April 2019, I was told again it would take 24 to 48 hours. I followed up again on 12 April 2019 and once again was told 24 to 48 hours and when I asked why nothing has been done again on 15 April 2019 I was told it would be done within 24 to 48 hours. No further feedback.