Unauthorized payments or **** from McAfee

I bought the McAfee last year around May for about R600.00 and to my surprise today I see a payment of R2132.00 from my account to them. I never asked for auto renewal on this thing and I do need it as it was not helping me as well. The worse thing is that it made my PC slow. To make matters worse they did not even warn me about this deduction.