Deleting Account from Online Banking Profile

Good day, I would like to log a complaint against FNB. Yesterday 05 June 2019 a transfer was made from one FNB account to another without any problems. Today 06 June 2019 I wanted to make another transfer from the same account - the account was deleted from my online banking profile. I called the online banking department where i held on for more than 20 min, I put the phone down and called back and spoke to Zandile just to be told my account was deleted and I should speak to the accounts department. The account that was deleted is my husbands account. I would like to know who gave FNB permission to delete this account as my husband never gave anyone instructions to delete his account from the online banking. I was told my husband should call and not me, however we have a joint account and i have full authority to operate on his account. I expect FNB to fix this as soon as possible as most transactions get done from my husbands account. This is unacceptable from FNB - Nobody gave an instruction to delete anything from my online banking. Please regard this matter as important and urgent and i expect feedback as soon as possible.