no messages

i have not been able to send a msg for a week now as it shows its going through but the other person does not receive it and no airtime is deducted when i phoned the call centre fist they gave me the wrong code to try and fix it and i was referred to the technical department where the lady i spoke to is absolutely the rudest person u do not speak to client in such a manner and tells me she also doesn't know what to tell me she is telling me it working which i made clear to her that its not then she gets rude and offensive and tells me to phone customer care as she is telling me they do not deal with this in her rude tone phone customer care gives me a new code still not working horrible service