Jeeves Consumer Services — Vu tv part complaint, not yet solved

I have reported the complaint on September 4th, service engineer said part replacement will consume 7 working days ..after 7 days I have asked to customer support then they asked 9 working days ..then waited..again they asked 10 days .now its consumed more than 1 month, yesturday 6th oct they came for part replacement and saying excuse like the part is not matching..its totally disappointed ..then what I need to do ..I need to replace tv unit or part replacement as immediate