2 days ago i brought Archer c6 Mu-mimo 1200mbps from flipkart. after installation and setup completed i am only getting  mbps download speed.i have 30mbps plan. on speedtest and other speed test apps download speed showing less that 1 mbps and upload speed arround 10 to 15mbps. i have checked with other single band router on same connection,that routr giving proper 30mbps speed.also getting proper 30mbps speed on direct lan connect.also i have updated it to latest version.i have called tp link cc and my isp as well but failed to resolve issue.my isp told me that my new c6 router is faulty and asked me to change it. so kindly help me if someone knows solution.

Thank you