IT messag error

I recently called in to find out if there is a possibility to increase the limit on my Store card. I have been calling in 5 times, every time the consultants advise that there is a IT message error and I should call back within 2 days, I call back within 2 days and than I get the same feedback to call back. I feel that they should be able to give me a valid reason for why this message keeps on appearing, not good service at all, rather tell me what is going on on my account seeing that I do pay my account on a monthly basis and have not skipped a payment since 2005 when I have opened up the account.