The mobile carrier (Three) have a problem affecting the activating and suspending of SIMs. They are aware of this and it is being worked on.
This is still open, we are chasing this with the carrier.
From the carrier: "Three have monitored the issue over the weekend and no further incidents of this have been reported. They have restarted the affected platform and all requests have been processed as normal. We're sorry for any inconvenience for the delay in processing the requests."