Sim card not active and data not working

<p>I am on an fnb sim card, that ive been using for several months now, My data services are not active, Ive been sent from pillar to post. I am not recieving all my phone call, I cant access any social networks and i have loaded data on the 4 october, It still shows i have 1 gig left but i cant use my cellphone for anything and all they have been doing is sending me from pillar to post and telling me follow the settings on my phone</p>