I am not recieving the airtime I'm paying for.

I renewed my contract in November last year, BBZ30. My airtime from my previous phone did not expire immediately so I was not worried about making calls. I recently realised I have Never received airtime on my current contract and when I go to the MTN site to lodge a query the \ask a question"page never loads. <br> <br> So instead of standing in one of the stores for 30mins waiting for overworked staff to assist me I'm asking here. I'm paying for it so"