Incompetence service received from Dstv

On the 24 March I canceled my Dstv account with Thabiso. Dstv is still sending me messages to pay the account that I have disconnected in March. My dstv account was always on a credit so he advised my account will be disconnected from the 1 April. I will not be paying dstv because I have the proof that the consultant confirmed cancelation. I was a premium customer and your'll sending me messages to pay R249 because I had a big credit i always paid alot extra every month. Please can someone investigate this.