No connection with FNB CONNECT

I purchased an fnb connect dim in branch around 2-3 months ago. My payments are upto date however I cannot use the sim for outgoing and incoming calls. I have contactef fnb using their chat function which was useless really as fnb connect does not offer customer service after hours contrary to what their automated system advises. I called fnb twice today and did what the agents asked me to however I am still not able to mske use of this sim...it just cuts off when I try the sim to make a csll or even if someone calls me. I get a frequent error at yimes that states 'sim not registered' or 'no network'. Come on now fnb...no use being professional but unhelpful. I am paying for a service I cannot use! Not a happy client.