Nimble Group are *****sters

I have been receiving SMSs from Nimble Group about a Standard Bank overdraft that they allege was taken out by someone with my initials and surname born on 1 April. Either than that ZERO evidence been provided to me to verify their claims. Not a date, or a document or picture or amount. However, they are telling me that they want a case number, 6 fingerprints, ID copy and affidavit within 7 days! What nonsense is this! The last time I had a Standard Bank account was 15 years ago! And the last lawyers who called me then closed the case as it was proven that I did not owe any money. But somehow Nimble Group appears to have resurrected a long prescribed matter that they are now hoping to cash from! Nimble Group can either take me to court or go to hell