joviegghead:
Let me start with this:
A BVN-generated NIN , i think, usually applies to early owners of BVN. If your BVN starts with 221... Or 2221 or 2222 just know you have an NIN waiting for you, you might not even know, just like when I went to register and was given an NIN and started facing this problem.

Now my problem:

So in 2018 I tried registering at an NIMC center in Lagos where I stay. Surprisingly, I and some people were told to back to our banks to correct our details, as what we submitted on the NIN registration form was different from what they saw as our BVN details. Also, I was surprised that I had NIN. Sadly, that day was the day I had prepared cuz I practically had no time.

Fast forward to this year, I had done every necessary correction on my BVN(affidavit, newspaper publication, bla bla inclusive). I went to the NIMC center fairly around where I serve(NYSC). I saw this as an advantage, since this northern states are practically uncrowded like Lagos . I mean you can literally stroll in and out with ease to do you NIN registration.
I got there first,but the man told me my BVN details didn't match my NIN details submitted. I told I had done the necessary changes. I even showed him necessary documents (I brought them along in case of any rubbish). He told me I had to generate remitta and pay #15000 and #500 for correction of Date of birth and Change of name. I was confused and I doubt that man what he was saying(he wasn't even sure too).

For Christ sake, I haven't registered for this thing AT ALL not to talk of having National ID or slip. Those that I know that pay for such are those who have registered and are trying to correct certain things on their slip

Weakly, I got up and left. I'm still confused on what to do. I'll appreciate if anyone with a similar experience share how they got round this problem.

This thing is holding me from many opportunities. Help please!!!

How did you go about it

You don't necessarily need the physical slip to link your NIN to your BVN. There are two ways to retrieve your NIN itself:

1. Retrieve Your NIN: You can get your NIN without the slip by dialing *346# on your phone (costs N20). This works on all networks.
2. Link NIN to BVN: Once you have your NIN, visit your bank branch to link it to your BVN. Here's a helpful guide on how to do it for FirstBank, UBA & GTB accounts - https://www.loanspot.ng/how-to-link-nin-and-bvn-to-gtbank/, https://www.loanspot.ng/how-to-link-nin-and-bvn-to-firstbank-account/, https://www.loanspot.ng/how-to-link-nin-and-bvn-to-uba/.

Also, if you don't know your BVN, you can learn to how to check yourself here - https://www.loanspot.ng/how-to-check-bvn/.

You're welcome!