Please someone knowledgeable about this situation should help a brother.

I received a message from GOCASH, The message read" Good day, kindly inform ***** ***** on 0803****** that he has defaulted in his loan repayment to GOCASH as you been the guarantor, he is advise(....).

I have no knowledge about this transaction, the person in quote was my room mate during our NYSC days, we have not spoken for long before today.

I called the number and he picked and I asked him if he has knowledge about the transaction which he agreed but that he didn't use me as a guarantor.
I called the sender of the message, he said he is the manager of GOCASH and I query him why someone used me as a guarantor to obtain loan without my knowledge and consent, he was rude in his reply..he told me I should go and ask the person and drop the call.

Please my fellow nairalanders, should i seek legal help or I should go and block my accounts to avoid unauthorized debit( if it's possible).
Or it could it be a fraudsters??

Please MOD push to front page to gain maximum attention.