Account Banned

Hello,
It seems my account has been banned for using the Cross Faction AH between my horde and alliance character. I read through the ToU and did not see anything against this. I used gold I collected on my horde character to buy some things from my alliance character. I didn't believe this to be illegal as the server takes a fairly substantial amount of gold transferred through this process.
My Alliance character is named Ghostson, Horde character is named Shakkakhan. Please let me know if I can have my account unlocked, or if this was actually against ToU and I am out of luck.
Thanks,
It seems my account has been banned for using the Cross Faction AH between my horde and alliance character. I read through the ToU and did not see anything against this. I used gold I collected on my horde character to buy some things from my alliance character. I didn't believe this to be illegal as the server takes a fairly substantial amount of gold transferred through this process.
My Alliance character is named Ghostson, Horde character is named Shakkakhan. Please let me know if I can have my account unlocked, or if this was actually against ToU and I am out of luck.
Thanks,