Not happy

I received my statement showing my payments a made on the 26 of oct and on the 9th of november and that im up to date, with the payments. On the 15th i received an sms saying that my account is in arrears. So i phones the customer service, and they basically said, i waisted my money on the 9th, because they don't accept advanced payment. So now I'a, suddenly 2 month behind. this is unacceptable. How can the statement say one thing and the sms another.<br> <br>