ADSL Cancellation in January but billed for March

I wrote to Telkom to cancel the fixed line rental and ADSL services for line *** on 21 January and later 08 February 2016.<br> <br> I have not had any feedback from Telkom but a bill for the month of March 2016. <br> <br> This kind of customer treatment is appalling to say the least, chasing the moolah and not attending to customer requests.<br> <br> What does it take to get Telkom to action customer requests or at least ansder to customer enquiries.