Hey Darshana,
I’m really sorry to hear this!
We don’t have any explicit rules in place that would restrict access from different locales. However, in the last 24-48 hours we did have some DNS issues with our own site.
Most of those issues have been resolved, so if your client tries purchasing again, do things work now? Or do issues persist?
If issues do persist, can you clarify exactly what is happening?
Is the client not even able to load http://theeventscalendar.com? Can they load the site but then the checkout process fails or something?
Let me know!
Thank you,
George