Hi Lorraineventure,
Thanks for your post and welcome to the forums. It's really great having you on board with us in the Community.
I'm sorry to hear that your neighbours PAYG SIM has been deactivated.
Unfortunately, in order to remain active the SIM would need to be used at least once in any 90 day period. If this time period passes then the SIM is deactivated and any credit left on the SIM will be lost too.
I know this will be unwelcome news but there is no way to reactivate it I'm afraid.
You can view this in our PAYG terms and conditions here: Terms and conditions of service - Pay As You Go Addict > Section 3.8 Keep talking!.
If you have any further questions, don't hesitate to get back in touch.
Thanks,