cancellation of credit card

On 21 August 2015 I went to the FNB branch in Hayfields Pietermaritzburg, when I requested my credit card with a credit balance to be cancelled. The necessary documents were signed and I was told that a staff member of the Retention department will contact me. On 29 August 2015 I went to FNB in Shelley Centre on the South Coast of Natal and did the same request and again signed the necessary documents. On 2 September 2015 I once again went to FNB at Hayfields and contacted the Retention Department in person. I was assured that someone will contact me. This is now a week later and I had no calls from FNB. I noticed this morning that more fees were taken off my credit card on 2 September 2015.