Poor services

Two weeks ago a friend of mine transferred R300 from his Nedbank account to my cellphone which automatically fall into their Nedbank Mobi Money. I tried to retrieve my pin by dialing *120*002# and I got an error message. I called the call centre on *** and I my pin was reset and I tried but the issue still persisted, I went to two of their branches in Carlton Centre and Parkstation but I could not be helped. I logged a call and when I called in today I am told that my entire account has been flagged and its closed. If there was any error with my account or any abnormalities why was I not contacted? All I am getting is that my account is closed.