Wrongfully charged, I cancelled on time

I am not happy with vodacom fibre I placed an order for fibre I never got it, to cut the long story short they gave me the LTE for a month and they said I must call and cancel before the month ends and I did just that , I cancelled in May before the 25th of the month , it means the consultant I spoke to didn’t cancel it until the month of July , now I see vodacom trying to deduct R1200 from my account I don’t understand this coz I cancelled in time , I then tried to call vodacom and one guy I spoke to seemed like he was gonna help but nope he kept me on hold for more than 30 minutes after that he said to me it’s taking long for someone to get back to him so I should drop and he will contact me as soon as he gets a response , I’m really not happy with vodacom for such a big company with people who don’t know how to do their jobs it’s appalling to say the least , they didn’t even send me the invoice until I called and asked what is it they were trying to deduct from my account , this is my number please contact me and rectify your mistake - ***