please help | Technical service details | Consumer forum

I just bought a sim card and $25 voucher from a retail store for my dad. I activated the phone but cannot refill. I tried both way sent *888*123456789012# and refill online. The website showed An error occurred on the backend system that prevented the process from completing successfully. We could be completing some routine maintenance. Please try again in a few hours.

Anyone has the same problem?

Thanks advance.