Terrible experience, they refuse to close my account

Terrible experience, they refuse to close my account. I requested for a statement of account to close my account. They sent it to me, I paid the amount in full and made them aware that my bank account is closed and will be paying via eft. After I made the payment they tried to debit another amount from my bank account, which I don’t know what it is for. I contacted them to close the account again, they told me to pay another amount to close the account, which they I did. I followed up again for the third time, now they are telling me to pay an additional amount because they tried to debit my bank account and it bounced. Some of the telephone consultants are very rude, another one said she is reaching out to management and never got back to me. They are just sending me from pillar to post.