CANT ACCESS MY SIM BALANCES AND NO HELP

I always logged into [URL Removed] to get my sim card balances and then one day it stopped working giving a technical difficulties error message. After 3 calls to the call centre they are telling me that they can't reset my account and further they cant delink my sim cards from this account which means I can't even register a new account to access these SIM card balances and so now I have to go out and by new sim cards - which I will be doing with another network. This is TOTALLY UNACCEPTABLE.