Unresolved Query on my active account

I have since reported my card on the 24th of July which got lost and someone has been swiping the card at the tollgate. FNB has not rectified my account despite several follow up and now I cannot use my account as it sitting on negative. This has caused so much inconvenience for me. I would appreciate this could be fixed or rather the account be closed as it is no longer serving the purpose. This is really bad service coming from this bank