Bad service ever

Home choice indicates that I have bought items on my account which were delivered to my home in Johanessburg, I don't even stay and have never stayed in Johanessburg. They asked that I must forward an email explaining that I have not bought anything lately under my account, however to date I have not had any response & they continue to debit my account every month for thing that I have not flipping idea about. The ***** expierenced on my account has been communicated why is it that such a big organisation fails to come back to me as their client, who has been with them for year beats the leaving hell out of me.