kent grand plus RO water purifier - fraud bill

I have purchased a water filer on **-**-****. After six months time, it had a few issues and they charged Rs.**** for fixing it. After * months when I approached the company to service the filter, a company representative came and informed me that the filter is old and its warranty has already expired in ****. The shop keeper has cheated me by selling an old filter of **** in ****. I have already got the invoice from the shop showing the date of ****.

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