Could'nt open new account after old one was closed

Somewhere in April I went to Edgars Tygervalley and asked them if I could change my 12mo Interest account to a 6mo non interest account and then also reduce my credit limit. They phoned HO and they told me I can't do this, I have to close my current account and then open a new one. I did an online application and after I heard nothing for some time I went to Edgars again to ask them what's happening with my application. They then said they my application was unsuccessful, but couldn't tell me exactly why(Also telling me they don't really give 6mo accounts any more). After a phone call to HO, they also couldn't give me a reason either. I had an account with Edgars paid between R400-R800 a month and every time I visited the store they wanted to increase my credit limit which was already more than R11000, but know they say my application is unsuccessful without giving me a good reason. So now I have NO Edgars account, because on their recommendation I closed it to open a new account.