BUNCH OF ******S BLACKLISTING ME FOR NOTHING!!!!!

SENDING SUMMONS THROUGH LIFESTYLE LEGAL AND TELLING ME I OWE THEM R2644.13 AND THEY GOING TO BLACKLIST ME. I DONT KNOW WHERE THEY GOT MY DETAILS BUT IM DEAD SURE I DID NOT APPLY FOR ANYTHING AND I DID NOT SIGN ANY TYPE OF FORMS FOR THEM. WHAT CAN I DO IF THEY BLACKLIST ME?