Unhappy Cleint

I've called and canceled my account with them which was already long overdue, and none or their consultants contacted me asking if I'm still interested in keeping the account. The account was canceled after paying for extra two months. I was not made aware of any outstanding debts and my account was canceled and an email was sent to confirm my cancelation in January 17th. Now suddenly there's outstanding amount of R2500 that I'm in arrears of and I'm only been made aware by seeing debit orders from and they say it's for the 2 months that my account has been in arrears for. I asked them why wasn't I informed of this when I canceled so it could have been sorted out in January not 10 months later when it has already accumulated so much interest. And these are apparently 2 debits from July and August 2021. why wait till now, they can't tell me I've been out of reach, when they have my full email address, home address and telephone numbers.