Multichoice are **********! Beware.

I cancelled my service with them effective 1 Nov '14. This was confirmed by email from them. Ever since, the account was still running, and they kept sending an ever-growing bill. Each time I emailed them in this regard they pretended not to know about it and denied it. Yesterday AGAIN I received a bill which is now at over R1500. All this despite continuous correspondence. I refuse to pay as I have proof of their confirmation of cancellation and it is very obvious they are trying to de***** me. Several people I know of have had similar experiences of their ******* conduct. I wonder if their share holders are aware of this ************ conduct?