We understand that it may have worked using your previous sim card.
However, after you've used our Sim on a different phone, it did work which shows that there's no issue with the sim we've provided.
ive tried the solution as mentioned below:
and its still not working.
Thanks for raising this with us.
We've checked your account and the outgoing calls were barred. We've already unbarred the service and it should start working.
Let us know how it goes.