No answer for more than a week

I have a request regarding my insurance with Cell C. With all my other phones I had insurance. Now that I have a more expensive phone I would like to know that my insurance is up to date. I have tried to phone the Cell C call center a few times this past week, I am on hold with that voice for longer than 20 minutes then the line gets cut off. I tried to contact C-sure them self but I also need to hold there. I am at work and can not hold on forever until someone decides that they feel like talking to a client.