airtime that i haven't received

I am so disappointed with cell c, I bought airtime on the 23rd of December 2015 through cell phone banking and my number was not recharged. I phoned customer service on the next day and I was told It will come through before 24 hours and I waited but there was nothing. I phoned again and they opened up a case with the reference number:*** they requested a proof of purchase and I sent a proof via email address [Email Removed] I waited for few days and there was no response again I phoned customer service to ask for a feed back they told me they will mark the case as urgent and one of the agents will phone me for a follow up but nobody ever phoned me. I am so disappointed with cell cif I was not on a contract I would be changing to another network