Roaming in Mexico

Hello. I have a Can-Us-Mex plan but I have not been able to connect to any network. Telcel and movistar both say (forbidden) behind them. No matter what I try it just won't connect. My data roaming is turned on, I have it set to automatically select network, and have also tried manually selecting a network which just ends with it telling me said network is unavailable. Any info would be greatly appreciated.