Poor Administration services

I have never been so frustrated in my life just for a simple banking details of the institution, they through statement of account with banking details that are not registered on CSD system. I have been calling Stadio College for the past 3 days with no luck, you hold the call forever until my airtime finished. The updated their banking details but still sends out statements with old banking details. They only have one number to call for everything. I have never seen something like this, you send emails no respond. Im sitting here all frustrated do even know what to do. Please get back to me as soon as possible with correct banking details.