Howdens Joinery - Greenock

I was completely happy with my Howdens kitchen, but my contractor left the job half done and some of the work left undone was in a dangerous condition and completely unsatisfactory condition. I have items surplus to requirement and a splash back for the hob which is too big for the space left. I have been told I cannot be refunded for these items and if I return them the money will go to the contractors account. I have been left between a rock and a hard place, I most certainly will not be having any more contact with the contractor, nor Howdens in case of any dispute with future contractors. WOULD YOU.