Call me campaign and no response for weeks

Standard Bank sent me an sms on 11 November offering to increase my credit card limit. As I require to use this facility, I responded and waited for the call. I again responded on 23 November but still no call back. Standard Bank, why bother doing this when you are not going to follow up? Then I might as well have just called in to the call centre myself. Alas, as per usual if you need anything done by Standard Bank, you need to log a complaint and only maybe then, someone will take action. I am so so sick of you as a bank.