Samsung India Hq, Tower C, Vipul Tech Square — No response after sent phones to them

Address:

Gurgaon, Haryana

I airmailed registered 2 CorbyB3210 phones to HQ on 20-4-15, reached India mainland on26-4-15 according to Singapore Post website item tracking RC[protected]SG. 4 days ago, l wrote to customer service requesting for blacklisting of the S/N numbers because registered mail if not delivered by 18days- it must have been stolen. But yet, there is no response from them about my blacklist request! I wonder did they actually read customer's emails at all? What do you think happened!