Incorrectly debited for R470

I have been a member of Kenilworth Virgin Active for a few years through the Discovery Vitality scheme. I canceled my Discovery and Vitality membership during September effective end September. I am therefore no longer using my Vitality gym membership - I am living overseas. I have just noticed that my bank account has been debited for R470 without my consent or any notice being given of this debit. This amount is far more than what I was paying through Vitality. Why has this amount been debited without my consent after canceling my accounts?