Gurudaya Infotech - Product key of MS-office not provided

I purchased Dell Vostro laptop from Gurudaya Infotech Jabalpur in September-October ****. They did not provide me with the product key of MS-Office which was included with the pc. Now the MS-office software asks me to activate the product key every time I use the software. It caused me mental trauma when I asked people from Gurudaya Infotech Jabalpur. They lied to me that Ms-office is not included in the PC though every time I open Ms-office in My pc it says Ms-office included with this PC please update the product key its a cheating by GuruDaya infotech and they might be doing this to many others as well.