Account ******* after closed

I cancelled my data 2 G data contract on the 4th Feb 2016 Ref number *** due to the fact that it was supposed to be capped at 2G yet I received a ridiculously high bill. Please note this contact actually had already expired last year. Now to my absolute horror I see you have debited me another massive amount which is totally and utterly impossible as this was cancelled??? You also have this data contract debit order linked to my cell phone debit order and I have now had to return the entire debit order as it is impossible to get through to speak to anyone at Vodacom!!!!!! I am highly upset.