Capitec unable to decrease my limit

Capitec increased my credit card balance without consulting me and it is now the 3rd time they are doing it, when I called them and asked them to decrease it they told me that I must go to branch they can’t help me. They are able to go to my account and increase my balance without my permission but they can’t decrease while I give them permission what nonsense is that!!!! I was on the phone with them for 20 minutes using my airtime now I must use my money to go to the branch for something that’s not even my fault. I am even thinking of closing the card because it keeps on increasing and they don’t inform me I just see it on the statement.