UNAUTHORISED CREDIT LIMIT INCREASE

I am fuming as i just received an sms saying my credit card limit has been automatically increased. I did not ask for this nor do i want this. I sent an e-mail aksing for this to be reversed immediately and was told to go to the branch. Why should fixing this be my problem though i did not ask for this. To make things worse i have a homeloan application pending, this could jeopardise everything. I WANT THIS REVERSED AND FOR CAPITEC TO MAKE SURE IT DOESNT HAVE ANY NEGATIVE IMPACT ON MY CREDIT SCORE.