Blacklist IMEI - Misinformation

In the early hours of this morning I logged a call to blacklist my mobile device. I was assisted by Scelo, she told me should couldn't find my device on her system. Which was a bit strange cause I have blacklisted a phone (same make & model), anyhow after sometime she managed to get my device on her system.

The device I used has two IMEI numbers she told me she can blacklist one IMEI number. Previously when I blacklisted the device (same make & model), the agent could blacklist two. when I went through the emails they sent me subjected "Blacklist IMEI" the IMEI numbers don't correspond with the ones I gave them. This is really confusing & unnecessary. I am even wondering if my devices are blacklisted or someone is still using them.