Standard Bank fail to send statements..

I contacted Standard bank to update my email address about 7 months ago, I was told I couldn't do it telephonicaly, so I went to the local branch to do it. I still don't get my credit card statements, so I paid my normal installment each month. Now Standard bank and lawyers are threatening me several times daily as they claim I am in arrears. Standard bank deny I updated my email address, and just tell me I will get my statements on the 7th of each month, but I need to pay the arrears and additional costs to get up to date. No one responds to my emails or query that they didn't send my statements. I have requested twice that a manager from the call center contacts me, I get told they will, but no one does.. I feel shocked by their response or lack of and insulted by their actions...