Signal problem after migrating from Contract

I cancelled my contract and migrated to pay as you go on the 19th October 2015. Since the 20th, I've had problems with signal. I was wondering why people call my work address and say my phone is off. I reserted the phone and still nothing happened. Now I only connect via work WIFI. I cant get my calls, emails, social networks messages, voice mail and even doing the balance check outside the WIFI. I bought airtime and data but still not winning. The worse part is that sometimes the phone will say simcard not registered on network. <br> <br> I've been with Cell C and using same number for 9 years on Contract. Today I called Customer Centre using someone's phone as mine was not working. The consultant did not give me even the case/ref number for the call. She said a technician will call me within 72 hours. Does that mean I will wait that long to get help from my network provider? If this is how they treat their pay as you go customers, I will port my number to other service providers.