Worst service ever and no response!!!!!

I did n sim swop on friday the 29th May because they said my sim was faulty. I was told to wait 4 hours and it will be ready. Its now the 3rd of June and my phone is still not working. I have been to MTN Cape Gate 2 times and phoned countless times. Nobody can help me. I was told that they have sent emails but nothing is being done. I need my phone for work and i cantvdo anything now. Someone better get back to me or MTN can take the contract i have and stick it where the sun dont shine. Bad bad bad service and nobody can ever help you. Waist of time!!!!