Moses, It could be that the system is having temporal issue which require that you can try it again in next few hours.
There are 2 ways you can access backup, you can access...
I bought a Mifi device from your shop at Ikeja City mall
S/N 320513884549
IMEI: 867462052329632
and MTN line 08104170681
and I was told I will get twice the data I purchase...
