No response from iBurst to complaints of no iCall

I have a contract with iBurst whereby they provide broadband service, called iCall, as a Voice Over Internet Provider to replace usual land-line telephone service. My iCall has not been working for days leaving me stuck with using my cell-phone to look for help from iBurst. Costing me a fortune whilst I hang on for response from Technical Support. Until I can no longer afford to recharge my cellphone. Frantic e-mail complaints to iBurst Help Desk go unanswered. Demands that my complaints are forwarded to the CEO if iBurst produce no response. I am frantic as not having my iCall working is causing me to loose business and I cannot communicate with clients and vice-versa nor can I check my Message Bank at iCall.