I am sorry about your missing line.
You will not be able to do a sim swap on a line that was not registered by you. However, ask MyCustomer who registered the line to visit...
I am deeply sorry for your missing line.
Kindly contact your bank to prevent an authorized access to your bank account if the line is linked to your bank accounts.
Sim swap by...
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...