Unauthorized debit order - after declining to renew my membership.

I was an AA member for probably 40+years and was OK with knowing when caravaning we had someone that could assist in the event of a breakdown. Where it started to go downhill with the AA, is I saw a strange debit go off my account. I battled to find out who this was that debited my account. I obviously reversed / disputed this unknown debit order, as the company could not be identified. After the debit was reversed, I suddenly received a call from a rather sour sounding person asking why I reversed the debit order. I was told it was my AA membership, and they had changed the way they did the debit order. I explained that there was NO email advising this, and as she was rather snotty about it, I told her to cancel my membership. I still received the odd call asking if I would like to renew my membership, to which I responded no thanks. Lo and behold I get a call last week, asking if I would consider renewing my membership, to which I responded no thanks, as my insurance now gives me roadside assistance. WOW ......today I see the AA have debited my account with R339....What the hell??? I NEVER agreed or approved my membership to be reinstated. How can the AA just renew without my consent. Obviously as I told him I have retired so no longer require the service, he thought he could quickly grab his commission as I am old and would not see the debit going off my account. HAHA Next I will take legal action and if that is not reversed ASAP and an apology is given to me, for *****ing my money.