CANT CANCEL EXPIRED CONTRACT :((

I HAVE BEEN TRYING TO GET HOLD OF MTN TO TRY AND FIND OUT HOW TO CANCEL MY CONTRACT THAT EXPIRED JUST BEFORE CHRISTMAS 2017. COULD NOT FIND ANY WAY AND THEN INBOXED VIA FACEBOOK. GOT A RESPONSE AND WHEN I REP**** THAT I DID NOT FEEL COMFORTABLE TO GIVE MY ID NUMBER VIA SOCIAL MEDIA, NO ONE RESPONSED!!!! I AM NO LONGER IN THE COUNTRY AND HAVE NOT USED THE ****** SIM SINCE END OF AUGUST SO YOU ARE GETTING MONEY FOR NOTHING. ALSO YOU WILL NOT GIVE ME WITH OPTIONS TO CANCEL THE CONTRACT THAT EXPIRED SO WILL YOU TAKE LIABILITY FOR THE DELAY AND REFUND MY MONEY???