BB Torch :: General Failure When Sending Emails

I have two email addresses set up on my phone, they are enterprise ones, I have always had access to send, forward emails for these accounts, now all of a sudden, I cannot forward or send new emails but can respond and am receiving emails. I called vodacom, they tell me that my account is an BIS and now I must change it to a BES account and reset up my account, but can only be done for the 1st of the month, and they cannot tell me why this has happened.