If it is the phone number with just omitted first 0, try to call the person.
Someone sent me ₦275000 last year. I called Kuda myself to refund the person. Kuda said they will. I guess the person went to her bank, they were unable to help her because likely what they will tell her is that she should contact me or maybe she go to police. I sent the money back to her after 3 days when I know that Kuda is not helping her at all.
It is just ₦5000. Try to contact the person or forget about it. The money needed for investigation is far more.
Baba the situation was easy for you to reach her and both of you communicating because she sent the money from a mobile wallet which you can easily see the phone number which double as account in her end which made it possible for you to trace and contact her.
Now ask yourself this question, what if she sent the money from a normal bank account how could you have contacted her for the refund.
Legal way to go about this:
If you send money to wrong account, you can go to any court of competent jurisdictions and get an affidavit that contains all the bank and transactions details with stamps, normally the process cost #15,000 to get the affidavit depending on the amount of money you sent to the wrong guy account, you then submit the court affidavit to the person bank, and once submitted you give them two weeks the money will be deducted and deposited back into your account.
Police have nothing to do with wrong transactions, it court and bank and if the person spend the money the bank will place the BVN of the person on red flag which means anywhere he drop money it will be taken as outstanding.