Builders Warehouse Communication Breakdown

I took a generator in for repair / replacement on Thursday morning, 15h December. I was promised a call to tell me how long I will be without my generator. It is now Tuesday evening, 20th December, and I'm still waiting for some basic response from these people. I have made 4 phone calls to their annoying call centre, and each time I am promised some action. I need my damn generator! Can somebody from Builders Warehouse please contact me with some info about my generator!!!!???