Microsoft — Fraud promotion by both microsoft and mobikwik

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Kolkata, West Bengal, 700129

I have purchased a Microsoft Lumia 535 in the moth of September 2015, as per promotional offer I was to get 300 Rupees cashback for 12 months that is 3600 Rupees cashback in total if i add 300 rupees every month into my Mobikwik wallet . This offer is also clearly given in Microsoft official website. This is the link showing that offer in Microsoft official site : https://www.microsoft.com/en-in/mobile/campaign-mobikwik-cashback/ I got the cashback only for three months that is it worked for September, October and November. From fourth month that is December when I give the code "LUM300" it says invalid coupon. I have tried number of times but same issue. All contact numbers given as Mobikwik's customer care numbers i tried, No person talks, only a recorded voice always says customer care executives are busy. No response even from the team if i submit this issue from the mobile application of Mobikwik. This is a fraud promotion by both Microsoft and MobiKwik to sell their stupid phones. I request the authorities to take action and settle the amounts for the same from the the fraud companies.