Sometimes after multiple tries, the SIM number also goes invalid. Try repeating it after clearing cache etc and if it still doesn't work, you might have to reach out to the Moderator_Team to check whether your SIM number is still valid and follow the...
If you are stuck, don't worry. There is always the Moderator_Team to help you out when you leave a private message with them and they are pretty fast in responses as well. They will resolve it for you.
