Cancelled my contract yet still paying monthly!

I got a premature contract cancellation quote, I paid the amount outstanding and forwarded the proof of payment as well as other documents as requested. After two weeks I was struggling to get an answer from Vodacom if my account is closed so I lodged a complaint on Hellopeter after which I was promptly notified that the account has been closed(20.04.2015) yet on the 05.05.2015 a payment of R473 went off my account for Vodacom! My normal monthly installment was R419 - how in the hell do they get R473 after my account has been closed!!! Pathetic is all I can say I will be moving to MTN and also will be encouraging all my social media friends to boycott Vodacom - they are ******** and just ***** your money. And the worst part is its like ****ing against thunder! You can do nothing about their incompetence - I've emailed Thato twice to get an answer to no avail!!! I am so fed up!!!