AA refuses to cancel my membership

In December 2017 I signed up over the AA website for the AA plan valued at R189.50 per month. After completing & submitting my online application form, I did not receive any welcome E-mail or any other information from them them to let me know my account was active. The only indication that I had that my AA application had gone through was that suddenly money was being debited every month for R189.50. Money has been debited from by bank account for the past 7 months (since December 2017). On the 09.07.2018 I tried to cancelled my contract with the AA, they told me that they can not find my account on their system. All I want is to cancel my contract with them but they keep on saying that without the policy number they can not help.