Not responding to sms old presrcribed debt i did not sign for

I was recently send sms to say i am ignoring calls and al ,i did send email to Mr M R Erasmus, Due to your Non/missed or low payments, we have been instructed to proceed with legal action against you. The Sheriff of the court may serve legal action at your home/work address. After Judgement we may be required to proceed with attachment of movable assets. Contact Lerato *** *** and Quote PLG0765 GL Attorneys.i do not recall the debt aswell when i went on website it shows fnb of 2012 accounts which is predcribed and at all i do not recall making loan at that time as i was under adminisyratìon order and may not have made and fnb may not have givin to me . Can u please investigate aswell as send proof of signed document that i can take it up with legsl council and consumer credit