Negligence

I have canceled my membership on the 5th of June and was told that I have to pay R58 but instead R453. 00was debited from my bank account. I reversed the R453. 00 and phoned Virgin active,i explained everything and Nathalia/Nathania promised to listen to the the telephone conversation of the 5th of June and update me.... Of which she did not. I got few calls from Virgin active collection department and explained the same story to them and they promised to get Nathania to call me back. On July the 20th virgin active debited R453. 00 from my account again, as usual I reversed the money and this time when I phoned them I am been put through to account department and while still explain I get cut off without being helped. Please assist me on how to go about this matter because people that are suppose to assist are not really helpful or just don't do their job.