Urgent please assist!!

Hi there I need to get some clarity.I have an account with Telkom.My bill is R1083 but Telkom only debits R599 every month now I've tried to send my nephew to go pay the difference at their pay point but there are some errors with the bill my account number doesn't exist.Ive tried several times to pay via EFT but my online banking shows wrong account number.I don't want my account to go into an arrears!!Ive tried several times to call with no assistance.Im working outside the country I hope someone can assist me please.My email address is **********