Pureit / Hindustan Unilever — Service

I have a pureit ultima ro+uv model purchased on 26.4.2015. One year warranty ends on 25.4.2015. Before warranty ends. On 7.4.2016 gkk1 r. I changed by the company technician. Very next day machine stopped working. Technician told first uv bulb fused. Then he told smps power supply had to be replced. Next day another technician came with control circuit assembly. But without fitting it he made the machine functional. On 8.7.2016 after the expiary of the warranty period the same problem occured.. Now the technician told to change control circuit assembly charging 4000/-. My question is when the same problem was detected before the warranty period expires, why the parts did not change free of cost. You had no amc paper offer at that time so that i can avail the opportunity. I think i am harassed and cheated. Will you intervene?