********** activity on my account

In December 2021, I paid my account in full. Asked the lady to close it. She gave me a number to phone. A few days later I phoned the call centre and asked them to close it. They said they couldn't because I had a credit of R2 or R3. Needless to say I NEVER used this account in 11 months. Yesterday, someone increased my account limit (without phoning and getting my permission-you know the security questions) and purchased a cell phone (at a retail store in Springs, I work in Germiston) whilst I was on the phone to the ***** division. My card is at home, in a drawer locked in my bedroom. So TELL me who gave the permission to increase my limit. I am very disappointed in the lack of work ethic and I want my account closed. I will not pay a cent.