The question starts with; how did they know your number and also about your search for money and then decide to use it against you?
I don't know if I've shared this story of mine on the general board but I know I have on my local board. It was something that happened to me when I went to create my BVN and first bank account.
It all started as a joke when I got to the bank - they were having a network issue so they rescheduled us for another day but on getting home I received a call and when I took the call the person at the other end called my name, date of birth and told me that I did come to the bank that day to create my Bvn and account - that I should check my message that I'll see both of them there and tell him the both of them so that he can just help me activate it so I won't have to come back to the bank again - I checked but there was nothing there (because of the network issue nothing was done for me)
On returning to the bank on the rescheduled date - I sat opposite the bank worker who was creating the account for me - and then I got a call from the same number, and he asked for the same thing (my Bvn and account number) I told him that I still haven't gotten it and ended the call. I then asked the worker I'm front of me if they had any worker by that name the caller told me but he denied it stating that it was a scam attempt.
But the issue now is - how were they able to get my information within less than 24 hours? Not only my phone number but also my details, I knew for sure that nobody was standing close to me during the period I was filling in my details, and yet it got leaked somehow.