Samsung — Galaxy M11 phone problem

Address:

37d/1d raja manindra road

I have purchase samsung m11 in jan 15 and when i got my mobile on 23 jan m11 have problem when my mobile goes in sleep mode for 30 minute its internet also stop so that time i am not able to get any message in whatsapp or social media site or email when i start my screen all message will enter in my phone i complain about this in online support several time and they reset setting and when my problem not solve then they ask me to go service center so i go there and they also factory reset my phone and give me back but not solve my problem and when i ask for refund because this phone have this problem they r saying this is manufacturing software feature in m11 so in next software update they will solve this problem .
i am freelance so i need notification so i can provide my support to my client pls i requesting samsung to refund my money so i can buy other phone

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Amount Paid: 11649.00
Order Date:[protected]:51:49