No Statement for 3 months

For 3 months now I have not received a statement on my account from Vodacom. The past two months I have had to phone to see what my balance is so I can pay my account. I have also requested that they check why I am not receiving my statements. This month I have still not received my statement and am not prepared to phone again to request a balance. If I do not receive a statement every month, Vodacom will simply not be paid. Every time I phone I have to answer to all your security questions. Last month, I could not give the agent my account number so failed the security. I am not prepared to go through this every month.