drop box package still deduct on my account

I have accepted an offer by vodacom of a Dropbox app to try out . I was not impressed with the product I called to cancel it a month later after complications with activating the app eventually work but was not impressed. According to the call center the person explain to me if you cancel Dropbox you cancel everything the full content contained within Dropbox but now i still receive deduction on my account from Dropbox product somu sim and techtrace of which I did not grant authorization for...plz help