UNACCEPTABLE SERVICE!

It is QUITE unbelievable that I agreed to a 24 month contract with an Explorer Ultra on the 21ST ÀPRIL, and still to date, NOTHING!! in the past 3 months I've had numerous sms's to say they were coming to install, NOTHING! I've taken time off work, used all my cell phone minutes, STILL NOTHING! I've had apologetic calls from supervisors ( the last one 10 days ago!) to confirm that immediate attention would be given, and the matter would be sorted out, STILL NOTHING 10 DAYS LATER! How can a company be so ***********?!?!? I need answers NOW!!