I need my number back

On the 09 December I noticed that my sim said no service,I didn't pay any attention to it and thought that it will be sorted ,the following day I noticed that it is still like that,I phoned customer care I couldn't go through .21 December I tried again a lady told me I must pay my account and send pop she cannot assist me. Today 28 December I phoned again only to find out my number is deactivated and i was advised that i asked for the line to be cancelled. How can I cancel the only number that I have. The last communication from cell c was that they were gonna debit me on the 25 and my contract will expire in feb I must contact the store. I really need this sorted out and that lady need to be answerable for deactivating my line.