DEACTIVATED NUMBER HORROR

I lost my phone finally I managed to get a new phone and trying to download my Whats App data back into my phone, the horror when I found out that Cell C deactivated my number and no notifications whatsoever. No w Please tell me how can I request my old number because my precious WhatsApp image of my newborn baby are locked because WhatsApp is sending OTPs that I cannot recieve. If you don't want me as a ustoer fine, but can I atleast get my number back to get my data andd then take it, I shall move to another network happily if this is how customers are treated. SOmeone from Cell C please help.