No response to dispute raised on credit card

On 26 October I raised a dispute on my credit card for an amount that had been deducted twice from my credit card. I completed the necessary forms, and received an email from Olo Phuncu to say that my dispute had been forwarded to ********** When I had no response after a month, I called Std Bank again, and was told that it could take up to 6 weeks to have the matter resolved. I called again on Fr 8 Dec and was told by the call center agent that 'there was progress on the issue, and that I would receive a call back before close of business', which, of course, I did not get. I called again on Monday 11 Dec, and was told 'they could not find any record of my dispute'. When I then quoted the name on the first e-mail, the agent magically found my dispute, and said that I would receive a call back from the person that the mail had originally been sent to, by latest today. Once again, NO RESPONSE. It is a small amount, but it is the principle of the issue, and now, over a very small amount, but because of an UTTER lack of service by Standard Bank, I'm considering moving all my accounts to Investec.