Returned device but my name was not cleared and account is not closed

I HAVE NEVER SEEN SUCH BAD SERVICE RECEIVED. I AM SO DISAPPOINTED. MY NAME IS BEING *****ED DUE TO THE DEVICE THAT I DON'T HAVE, THEY OFFERED ME A ROUTER AND IT DIDN'T WORK WHERE I STAYED AND I WAS ADVISED THAT IF I AM NOT SATISFIED I SHOULD RETURN THE DEVICE WITHIN THE GIVEN DATE ID WHICH I DID, NOW THEY HAVE ROUTED MY NAME TO THEIR LEGAL DEPARTMENT SAYING I OWE THEM.. I OWE THEM WHAT??? I'VE SENT EMAILS TO THEIR COMPLAINTS DEPARTMENT NO HELP RECEIVED.. NOT FORGETTING THAT I WAS ONCE A VICTIM OF ***** FROM MTN STILL.. YOH I AM SO HIGHLY DISAPPOINTED AND FURIOUS. I NEED MY NAME CLEARED