TTK Prestige — mixie

There is a sound issue in the mixie since the day i have purchased it, made a complaint and the mechanic told me that as the wattage is 750 w hence the sound is normal. This all happened durinf dec-jan.
This month made the complaint again to the service head and the company told me that there is problem with the motor hence the motor will be replaced.
Now i purchased the product from amazon and if the mechanic initially informed me that the product is faulty i could have got it exchanged however now the complaint is pushing me to get the motor replaced and did not want to replace the product