Blocked sim card..no response

I was unemployed for a few months and fell behind on my payments. In this time I paid up the account twice and the cars was not reconnected. I havn't had use for it since Feb15. On 29 JMay I paid it again and still not activated. Calling customer care is a waste of time....NEVER do you get through. On 29 June I sent an email and again on 1 July. I had 1reply on the first one stating if they don't get back to me I must call c/ service. That's all we do every day!!! Call and hang on for how long and/or the line get cut off as soon as it rings on the other side. No contact what so ever to sort it out. But I get billed every month! I cannot keep paying for something I have not used for months. <br> Thank you*