Symphony Limited — service problem

I have complaints regarding improper service, technician was came at home and said ther is a mistake i will come in a week with a parts, after a week i called him up he said parts are not available wait for it i will cal u after 3 days again i cal the same reason was there, in customer care i have called but no response i am getting its more than 20 days. Summer season has gone now what shouid i do?