Airtime not loaded

On 30 June 2015, I loaded R150 airtime on my phone, via an atm transaction. At 17:00 on the same say, I phoned Cell C to enquire why my airtime was still not reflecting, when it should have reflected instantly. I was told that they had high vokumes, due to month end, but that it will eventually reflect. It is now more than 48 hours later. I am unable to make or receive calls. I can't even phone cell c customer care, as it gives a not registered on network sign when I try. Needless to say, I will move to another service provider over the weekend. Preferably one where I don't struggle with reception either.