Major Engine failure and Turbo failure no response from H/O

I bought a Ford Ecosport on Tuesday last week. By Saturday afternoon the Engine is ******red and so is the Turbo. I logged a complaint with the branch and the website on Saturday. We Buy Cars service provider said that the Turbo is blown and 2 cylinders on the Engine has malfunctioned. to Fix the engine will take 3 to 4 weeks to fix. I have no transport now and I was going to go away this weekend. I am highly upset and want to cancel the deal. I get refered to head office the whole time and no one from head office has called me back. Marnus from We Buy Cars PE just keeps refering me to H/O and I must wait for a call. I cannot wait for a call, I need my deposit back ASAP in order to purchase another vehicle.