Sale not done according to my instruction

On the 6th Aug 2019 I app**** for a credit card limit increase on their website. I was then requested to upload recent documents which was done. On the 09th Aug 2019 I received a call from their Head Office and the caller was Tshepo who from their sales desk to assist me with my online application. My credit card facility was R 15000.00 and he mentioned a limited increase of R 16500.00 which I gladly accepted. We completed the application telephonically with him quoting me R 2901.00 as a monthly instalment over a period of 12 months. In accessing the funds the following day I picked up that there was something that did not add up as the current facility was increased by R 1500.00 to R 16500.00 which is misleading. The limit of increase of R 16500.00 was not done as expected. I spoke to their contact center on Monday the 12 Aug 2019 citing that the limit increase was R 1500.00 not R 16500.00 as proposed. A lady by the name of Thembi being a supoervisor requested me to refund funds which were withdrawn from the account and request a African Bank branch to reverse my credit card facility to original by logging a dispute. I did so however I received a text from the bank informing me that my request was unsuccessful. I want the bank to reverse my facility to original as I was not sold a correct product. I was sold a new credit card facility of R 16500.00 not a credit limit of R 1500.00. I app**** for an increase in my facility of R 16500.00 not R 1500.00