Sim activation failure

[Riotarou]

After receiving the sim, a number is sent to the sim to start activation, but when I enter the number, it says failed, what should I do?

[Anonymous]

Hey, @Riotarou 

Let me help with the activation of the SIM and see what we can do about this. Could you shoot me a PM with your details?

How to send a PM? 

Regards,

After receiving the sim, a number is sent to the sim to start activation, but when I enter the number, it says failed, what should I do?