Been without network since Wednesday night!

My Cell C network suddenly disappeared on Wednesday night while using whatsapp, I have only been able to use whatsapp via wi-fi since.<br> <br> I have spoken to the customer service twice and all they tell me to do is to test it in another phone (very difficult by the way as I have a micro sim!) and if it doesn't work, call them again for a sim swop.<br> <br> I can't test my phone and it keeps saying emergency calls only! No explanation as to why the network suddenly disappeared like it did