No assistance

I had 2 contracts with cell c. Upon upgrading I called the call Centre to cancel both contracts. The lady said it's all done. A few months later I noticed funds being deducted for cell c and I received a statement too. I went in store and they confirmed 1 contract is still active. I considered upgrading but then they wouldn't assist me with my ****en ID. so I called the call Centre multiple times to cancel but can't get through. The store won't help me as all they say is "call the call Centre". The Centre is now Mondays to Fridays 9am to 5pm. I work till 7pm. So I can't call. I need help please as I'm paying for a service I'm not using.